Earth travels about the sun in an orbit that is almost circular (eccentricity close to 0). Assume that the orbit is a circle with a radius of 93,000,000 miles. Its angular speed and linear speeds are used in designing solar-powered facilities. What is the linear speed of Earth in miles per hour?

A) 58,734 miles per hour
B) 65,458 miles per hour
C) 70,146 miles per hour
D) 71,784 miles per hour