Who said, “We’re sinking!”?
The correct answer is option 'B', Mary. Mary said, "We're sinking!" in the given scenario.

Explanation:
Here is a detailed explanation of the answer:

Introduction:
The question asks about the person who said, "We're sinking!" in a particular situation. To determine the correct answer, let's analyze the given options.

Option Analysis:
a) His crewmen: The crewmen are the members of a ship's crew. While they might have noticed the sinking, it is not specified in the question that any specific crew member said the phrase. Therefore, option 'a' is not the correct answer.
b) Mary: This option states that Mary said, "We're sinking!" This answer seems plausible because Mary could be a person on the ship who noticed the sinking. Therefore, option 'b' is a possible answer.
c) His daughter: The question does not provide any information about the person who has a daughter. There is no context given to support this option. Therefore, option 'c' is not the correct answer.
d) His son: Similar to option 'c', there is no context or information given about the person who has a son. This option lacks supporting details. Therefore, option 'd' is not the correct answer.

Conclusion:
By analyzing the given options, we can conclude that Mary is the person who said, "We're sinking!" This answer is based on the plausible assumption that Mary is a person on the ship who noticed the sinking.