She will be very angry unless we do not reach there on time. [Choose the Correct Answer]

A. She will be very angry unless we are not there on time
B. She will be very angry unless we shall not reach there on time
C. She will be very angry if we do not reach there on time
D. She will be very angry if we did not reach there on time

Correct Answer: C. She will be very angry if we do not reach there on time