Direction: The following question consists of a sentence which is divided into three parts, with grammatical error in one or more than one part of the sentence. If there is an error in any part of the sentence, find the correct alternatives to replace those parts from the three options given below, to make the sentence grammatically correct. If there is an error in any part of the sentence and none of the alternatives is correct to replace that part, then choose 'None of the A, B, and C' as your answer. If the given sentence is grammatically correct or does not require any correction, choose 'No correction required' as your answer.

Thanks to modern medicine, (A) most people are able to remain reasonably healthy past 60, and (B) even if physically slower, remain capable of top-quality intellectually performance. (C)

(A) Thanks for modern medicine,
(B) most people is able to remain reasonably healthy past 60 and,
(C) even if physically slower, remain capable of top-quality intellectual performance.