Question

If you call to him to explain your problem he will help you.
1) call upon him
2) call in him
3) call at him
4) No correction

Answer 1

There is no correction

Answer 2

The answer is (4) no correction.

Out of the 4 options the answer 4 (iv) no correction is the right answer.

All the options like 1, 2, and 3 are indicating other meaning via the group verbs used with the finite verb call.  

Call to him is used as a phrasal verb, and has served the perfect purpose of deciphering meaning.