'since the last one year' is the correct expression, so option (B) part (B) of the sentence has an error.
English Grammar CTET MCQ - Error Editing and omission
DIRECTIONS (Q.Nos.42 and 43) Questions have been divided into four parts as (A), (B), (C) and (D). One of the four parts has an error. Find the error part.
DIRECTIONS (Q.Nos.42 and 43) Questions have been divided into four parts as (A), (B), (C) and (D). One of the four parts has an error. Find the error part.

