Answer:
The correct meaning of the word 'necessitate' is 'require'.
Explanation:
The definition of necessitate is to make something necessary as a result or consequence. In this case, require is not only a synonym of necessitate, but it is also the choice that makes to most sense, so the correct answer is 'require'.
Answer: No, you can not say it is possibly. You must say, in order to be grammatically correct, it is possible.
Hope this helps! :)
Explanation: