It was quite clear that the runner could be able to improve upon his own record. A. will be able B. should be able C. would be able D. No improvement

The correct answer is C. would be able.

The sentence “It was quite clear that the runner could be able to improve upon his own record” is in the past tense. This means that the runner was able to improve his own record in the past. The verb “could” is used to express possibility or ability. In this case, it is used to express the possibility that the runner was able to improve his own record. The verb “be able” is used to express the ability to do something. In this case, it is used to express the ability of the runner to improve his own record. The verb “will” is used to express future possibility or certainty. In this case, it is not used correctly because the sentence is in the past tense. The verb “should” is used to express obligation or necessity. In this case, it is not used correctly because the sentence is not expressing an obligation or necessity.

The sentence “It was quite clear that the runner would be able to improve upon his own record” would be correct if it were in the future tense. For example, if the sentence were about a runner who was about to compete in a race, the sentence would