Find the Average Density of a Red Giant Star with a Mass

Multiple Choice

Find the average density of a red giant star with a mass of 20 * 1030 kg (approximately 10 solar masses) and a radius of 150 *109 m (equal to the Earth's distance from the sun) .

A) 1.41 * 10-4 kg/m3
B) 0.007 kg/m3
C) 1.41 kg/m3
D) 710 kg/m3
E) 1.41 *10-3 kg/m3