Indira starts from point A, which is 7 km towards East of point B. From point A, she drives 4 km towards East. From here, she takes a left turn and drives 9 km. She then takes a left turn, drives 9 km and stops at point C. If from point C, Indira drives 9 km towards South, how far will she be from point B?

A

2 km

B

4 km

C

1 km

D

3 km