The internal energy of a monoatomic gas is 3nRT. One mole of helium is kept in a cylinder having internal cross section area of 17 $$cm^{2}$$ and fitted with a light movable frictionless piston. The gas is heated slowly by suppling 126 J heat. If the temperature rises by $$4^{o}C$$, then the piston will move ____ cm.
(atmospheric pressure= $$10^{5}$$ Pa)

A

14.5

B

1.45

C

1.55

D

15.5