A student tightens three identical bolts using the same wrench so that the magnitude of the applied torque is the same in every case. Bolt A is turned through 90∘, bolt B through 180∘, and bolt C through 270∘. Rank the bolts according to the work done on them, from greatest to least.
a) A=B=C
b) C>B>A
c) A>B>C
d) A=C>B