The gases in two identical containers are at 1 atmosphere of pressure and at room temperature. One contains helium gas (monatomic, atomic mass 4) and the other contains an equal number of moles of argon gas (monatomic, atomic mass 40). If 1 joule of heat added to the helium gas increases its temperature a given amount, the amount of heat that must be added to the argon gas to increase its temperature by the same amount is

A) 10 joules

B)√10 joules

C) 1 joule

D) 1/√10 joules

E) 1/10 joules