The correct answer is B. Mark Zuckerberg.
Orkut Buyukkokten is the founder of Orkut, a social networking service that was once the most popular website in India. However, Orkut was discontinued in September 2014.
Bill Gates is the co-founder of Microsoft, one of the world’s largest software companies. However, Microsoft does not operate a social networking service.
Martin Cooper is an American engineer who is credited with inventing the first handheld cellular phone. However, he is not the founder of any social networking service.
Mark Zuckerberg is an American computer programmer and entrepreneur who is the co-founder and CEO of Facebook, the world’s largest social networking service. Facebook is currently the No. 1 social networking Website in India.