The question states a large lake vs a smaller pond.
Now, you can take out the temperatures given. They are meant to distract you. The larger body of water will always have more thermal energy, hence the fact that it can withstand more than something smaller.
So thereby, the answer is B; The total thermal energy is greater in a large body of water than one much smaller.
Hope this helps! (ik this was asked a while ago, but brainliest would be very kind!)