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4. Persuade
is the correct answer
Although it is PERSUADE, but sometimes if you do it well, it will be like indirect FORCING.
I think the no.4.Persuade is the right option.
While most of the commentators say it as 'Persuade' I think it is wrong. Mr. Vinod Jetley has given the best explanation. Influence doesn't merely means persuade it depends on different scenarios, places and people. A police officer might force you to do things which you might never do, its not persuasion likewise a opinion poll before casting of vote will influence a voter or someone use their influence to get favours and now a days we see the influence of social media/television on the radicalization of youths.
To the best of my knowledge it should be Persuade.
Persuade someone to something.
4. Persuade - as influencing means have a direct or indirect impact on the subject person to convince him over.
the capacity to have an effect on the character, development, or behaviour of someone or something, or the effect itself. It can be done through convincing, persuasion, threatening or begging