Evaluating Temperature v time graph

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The discussion focuses on verifying the accuracy of answers related to a temperature versus time graph. Participants agree that answers for parts (a) to (e) appear correct, but there is uncertainty regarding part (f). The graph's interpretation and the reasoning behind the answers are central to the inquiry. Clarifications are sought to resolve the confusion surrounding part (f). Overall, the conversation emphasizes the need for accurate analysis of the temperature data presented.
Miike012
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Can someone verify if the answers to part a of the question are correct?
Question and answers are in doc
 

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(a) - (e) appear correct. (f) puzzles me.
 
The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?

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