The sooner he comes to terms with it, the best it will be for him.
Use the better in comparative sentences to express improvement with time.
it will be good
The correct phrase is the better as it fits the comparative structure of the sentence, which is used to show the improvement in the situation as it progresses. The use of the better is common in such sentences to show the cause-and-effect relationship. - Option (B) is incorrect because the best would make the sentence sound unnatural in this context. - Option (C) and (D) don't match the sentence structure properly. Thus, the better (Option A) is the correct choice.
The construction "the sooner..., the ___" follows the fixed English pattern "the + comparative, the + comparative," so checking whether each option supplies a comparative form in the matching structure settles the choice.
Only option A maintains the required comparative-to-comparative structure of the sentence.
Hence, the correct answer is Option A.