Final answer:
The word "to need" is synonymous with "to require."
Step-by-step explanation:
The correct answer is a) Require. "To need" is synonymous with "to require." When we say we need something, it means we require it or it is necessary for us. For example, if I say, "I need to study for my exam," it means studying is required for me in order to do well on the exam.