Select the most appropriate option for blank (1)
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. both.
The correct word to fill is "both" because it indicates that chimpanzees spend their day in two places: in the trees and on the ground.
The other options are incorrect as "either" implies one of the two, "neither" suggests neither option, and "all" refers to more than two options, which does not fit the context.