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.

While most western countries has increased (A) their retirement ages to 65 and 70 (and the US has outlawed compulsory retirement altogether), (B) we are still letting people go when they could be making a major difference. (C)

(A) While most western countries have increased
(B) their retirement ages to 65 and 70 (and the US has outlawed compulsory retirement altogether)
(C) we are still letting people go when they could be making a major difference.