Some of the sentences are grammatically correct and some are incorrect. Find out which part of the sentence has an error and mark that part. If there is no error , mark that part as your answer.
`(" Since his arrival at his native town")/a` `("he is trying to the best of his power")/b` `("to spread education among the poor masses")/c` `("No error")/d`

Explanation

(b) Say .has been trying.