The Dwarf Planet Eris Has a Moon Called Dysomia, Which

Multiple Choice

The dwarf planet Eris has a moon called Dysomia, which is much smaller in mass than Eris. If Dysomia has an orbital period of 16 days and orbits Eris at a distance of 40,000 km, then what is the mass of Eris?

A) 2 * 10¹³ kg
B) 2 *10²² kg
C) 2 * 10²⁸ kg
D) 2 *10³² kg
E) 2 * 10³⁵ kg