A Gas Fills a Rigid Box at One Atmosphere and 21

A gas fills a rigid box at one atmosphere and 21 ^$\circ$ C.If we increase the pressure to 1.4 atmospheres,what is the temperature of the gas in the box?

A) 100 ^$\circ$ C
B) 140 ^$\circ$ C
C) 150 ^$\circ$ C
D) 50 ^$\circ$ C
E) 130 ^$\circ$ C