Low Earth Orbit (LEO) Is Approximately 150 Miles (240 Km) $\times$

Low Earth orbit (LEO) is approximately 150 miles (240 km) above the surface of the Earth. The radius and mass of the Earth are 6.4 $\times$ 10⁶ m and 5.98 $\times$ 10²⁴ kg. The velocity of the space shuttle in LEO

A) is 7.9 km/s.
B) is 7.7 km/s.
C) is 7.9 m/s.
D) cannot be determined without knowing the mass of the shuttle.