Correct Answer - Option 3 : Tapas is rich and so he has a lot of influence.
If a person is rich, he has lot of influence.
i) Alok has a lot of influence, so he is rich. → False (as relation is 'rich person have influence' and vice versa may not be true)
ii) If a person is not rich he does not have a lot of influence. → False (as relation is 'rich person have influence' and person who is not rich(poor) may or may not have influence)
iii)Tapas is rich and so he has a lot of influence. → True (as relation 'rich person have influence' is true here)
iv) Poor people cannot have influence. → False (as relation is 'rich person have influence' and person who is poor may or may not have influence)
Hence, 'Tapas is rich and so he has a lot of influence.' is the correct option.