The Average Distance Between the Earth and the Sun Is $\times$

Multiple Choice

The average distance between the Earth and the Sun is 1.5 $\times$ 10¹¹ m. The tangential speed of the Earth in its orbit about the Sun is

A) 45 km/s.
B) 60 km/s.
C) 15 km/s.
D) 30 km/s.