In each question, a sentence with two words/ groups of words printed in bold type are given. One of them or both may have certain error. You have to find out the correct word or group of words from among the three choices A, B or C given below each sentence which can replace the wrong word/group of words. if any, and makes the sentence grammatically correct. If the sentence is correct as It is, mark e: i.e. ‘No Correction Required’ as your answer.