Answer: Option A
Answer: (a)The real intention of writing the given sentence is to express a hope that he will become successful in the forthcoming examination, ie, he will prove his merit. Therefore, for the phrase written in bold the correct alternative is given in (c). Now, let us consider other options also for their validity. After ‘be’ V3 is used, but, in option (b), after ‘be’ V1 has been used. Therefore, this option is ruled out. Option (a) has ‘will have to prove’ which means he is bound to prove, but the real intention is to express a 'hope' not a binding. Therefore, (a) cannot be a correct choice. Now, when option (d) is placed in place of the phrase in bold, the sentence becomes a mixture of present and past tense. Such type of structure is not preferred. Hence, reject it.