Choose one of the following options. Which one do you think is the best method of advertising?

All of them are imoprtant , the channel depends on the edge pf the product / service and the right customers for the product i.e. you not logic to promote WIFI only when your connected ; or promoting diet pills on line in the countries the internet coverage very low ...etc. 

Your question is too general. All of these options are good for specific businesses. It depends on what you promote and what you sells, but it depends on your target audience, too. I think on their habits in communication and receiving information. For example, if you sell something for the generation Z than you choose cell phone and mobile advertising etc.

Personally i think it depends on the nature of product and also the budget for marketing. If you have limited budget you should opt for online advertising and mobile advertising. If you are targeted consumer are not limited and you want to go for mass consumers you should go for Broadcast Advertising.

It depends on the product  you want to advertise (and the targeted persons, clients).

But Online Advertising (Emails, Visibility on social Media...) is generally most efficient and also shows that the company is a modern.

All are great way to advertise but as we are living in electronic world where everything is online I would say Online Advertising is a good method as sending coupons through email , posting them on the website.

BROADCAST    ADVERTISING METHOD