Answer:
D
Explanation
the only other answer i could think it would be would be field research. but why i think it isn't that is because field research is going out and getting research your self.
The correct answer should be B. living with others
The diver strapped the aqualung to his back in preparation to dive
Written prose tends to follow a specific rythm and rhyme scheme. Also, written prose usually has sentence structure that differs from casual speech in order to fit that rythm and rhyme.