Why are marketers are concerned with consumer behavior?

I will say D, as sometimes a brand is launching something, not expecting great great sales and suddenly the customer starts talking about this product positively and the sales start growing and growing. 

Option D is the most appropriate answer.

(d) The way consumers respond to a business’s marketing strategies has a large impact on the firm’s success.===============================

 The way consumers respond to a business’s marketing strategies has a large impact on the firm’s success.

I am with the fourth - the way consumers respond to a business’s marketing strategies has a large impact on the firm’s success.

In this regard, I srongly believe the opinion of Steve Job who has understood the consumer's nature and behaviour exactly than anyone else....'customer does not know what he wants'. That is so right. There are so many wants and needs buried in our subconscious that we are not even aware of"

He succeeded in his opinion through his bitten apple.

That would be answer D. 

Understanding the thinking, objectives, and motivations of consumers is all a part of consumer behavior and basing the firm's marketing strategies accordingly is the driving force of its success.

(D) 

Consumer's control the type of marketing strategy a business may use and their behavior is somehow unpredictable in reaction to new marketing campaigns thus the need to consumer behavior studies. These studies would align the organization's goals with the consumers needs and wants to spawn a value co-creation relationship. 

Thanks

It is (D) ............

about me it is option " D "                         .

Because consumers are the lifeblood of any business. 

Consumers’ tastes and preferences are always changing regarding color, design, size etc. For effective market segmentation and target marketing, it is essential to understand consumers behavior.

thank you Miss ghada It is simple answer is option D.

The study and analysis of a single consumer of the most important marketing activities in the organization's behavior, which emerged from the periphery developments due to intense competition and the breadth of the size and type of the alternatives available to the consumer on the one hand, and the change and the diversity of needs and desires on the other hand, has become imposed on the organization need excellence in its products both in terms of quality or price or method of advertised or distributed and in conformity with the consumer and financial potential, and this is to ensure the acquisition time, enabling the organization to grow and survive, where the production policies of the institutions of the concept of selling what can be produced to become a new concept is based on the consumer as the master of the market according to the so-called producing what can be sold, and this can be achieved only through the marketing activity is based on the study of consumer behavior and the overall conditions and influencing factors and specific preferences and consumption patterns, through investigation and continuous surveillance for the whole of his actions and his views on what raises him and what he wants and wishes to obtain.