I believe it is D because the allies weren't formed yet before war broke out but when it did, that's when the allies were formed.
Answer:
complement
Explanation:
The above answer is the correct answer.
Crew members must <u>complement</u> each other. This is true because from the excerpt, we were told that "An alternative to the shower is a wobbly platform that two or three crew members have to stand on and jointly balance with hand controllers". This depicts that these crew members must complement each other if they must use the platform. Without such synergy in balancing the platform, they will not be able to use it.
C
The answer you picked seems most appropriate to the statement listed above