Large Meteors Can Impact the Earth with Speeds of 80,000 $\times$

Multiple Choice

Large meteors can impact the earth with speeds of 80,000 km/h.If such a meteor were to impact at a point on the plane of Earth's equator,resulting in a change of Earth's angular momentum by 80 × 10¹² kg • m²/s (an insignificant change,thankfully) ,calculate the mass of the meteor.(The radius of Earth = 6.38 $\times$ 10⁶ m.)

A) 3.4 $\times$ 10⁴ kg
B) 5.6 $\times$ 10² kg
C) 3.6 $\times$ 10³ kg
D) 4.5 $\times$ 10⁴ kg
E) 56 kg