Purveyors of Salts from the Dead Sea Advertise That It

Purveyors of salts from the Dead Sea advertise that it is healthy to bathe in a saturated solution of magnesium chloride (MgCl₂, 95.21 g/mol, K_sp = 740) . How much magnesium chloride would you have to purchase to make up 10.0 L of bath water saturated with magnesium chloride?

A) 9.0 kg
B) 12 kg
C) 57 kg
D) 5.4 kg
E) 7.2 kg