Can anyone figure out this BR physics problem?

[MCAT guy]

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6. The exhaust steam in a one-cylinder steam engine is condensed:

• A. to recover the heat energy originally used to vaporize water into steam for evaporating more water in the boiler.
• B. so that the fluid is more dense and better able to flow through the pump.
• C. so that the piston does not overheat and expand.
• D. in order to reduce the pressure in the condenser, to allow vapor to escape from the piston when the exhaust valve is opened

The answer is not D, but the solution on the FL is broken and they didn't provide a right answer or solution.

 

[Pulsar]

I'm fairly certain the answer is A. That type of setup will maximize the efficiency of the cycle. If you didn't transfer the heat to the incoming stream all that energy would be effectively wasted.

 

[MCAT guy]

BUMP for more feedback.

 

[ElliottB]

I'm fairly certain the answer is A. That type of setup will maximize the efficiency of the cycle. If you didn't transfer the heat to the incoming stream all that energy would be effectively wasted.

Also what I was thinking.

 

[physcigirl27]

I am looking at this question right now and I picked A but it said it was wrong... I don't know what other choice it would be though... :/

 

[shffl]

Well through process of elimination..

D can't be correct for sure
C can be eliminated as well because heat will most likely increase if steam is condensed so it won't be preventing any overheating
B having a more dense fluid does not does not mean better flow...? not sure on this

I would have chosen A but since it's wrong...can someone explain?