In the sentence identify the segment which contains the grammatical error.
The subway system has become very safe and it has come a long way since the 1980s and 1990s where violence was rampant.

Options

A. has become very safe
B. a long way
C. where violence
D. it has come

Answer

C

Explanation

where के स्थान पर when होगा क्योंकि समय के लिए एक pronoun इस्तेमाल करना है।