Sentence Correction (SC) | Re: The activism of state citizens, who have demanded safer road condition

The activism of state citizens, who have demanded safer road conditions as well as stiffer penalties for intoxicated drivers, have led to a significant decrease in the number of traffic accidents.

A. have led to a significant decrease in the number
B. have led to significant decreases in the amount
C. has led to a significant decrease in the number
D. has been significant in the decrease in the number
E. has significantly decreased the amount