An ideal gas undergoes the cyclic process abca as shown in the figure. The internal energy change of the gas along the path ca is $-180 \mathrm{J}$. The gas absorbs 250 J of heat along the path ab and also absorbs 60 J of heat along the path bc. Find the work done by the gas along the path abc.

• A

  130 J

• B

  140 J

• C

  120 J

• D

  100 J