$(5$ pts$)20.$ Consider processes A and $B$ for $5\mathrm{.}0$ moles of a monatomic ideal gas. The same amount of heat energy is added to the gas in process $A$ as in process $B.$ In process A the volume of the gas is kept constant and in process $B$ the volume of the gas increases. In which process is the temperature increase of the gas the greatest?

$($a$)A$

$($b$)B$

$($c$)$ same for both