Half mole of an ideal monoatomic gas is heated at a constant pressure of 1 atm from 20$$^{\circ}$$C to 90$$^{\circ}$$C. Work done by the gas is (Gas constant, $$R = 8.21$$ J mol$$^{-1}$$ K$$^{-1}$$)

A

73 J

B

581 J

C

291 J

D

146 J