Final answer:
The best choice for the definition 'to loosen, as a grip, or take it easy' is 'A) Relax.' Although 'unwind,' 'slacken,' and 'release' have similar meanings, 'relax' is the most appropriate term in this context.
Step-by-step explanation:
The question asks for a word that means ‘to loosen, as a grip, or just to take it easy.’ The correct answer is A) Relax, which means to make less tense or rigid, or to become less stressed and more at ease. B) Unwind may seem like a correct choice as it also means to de-stress and loosen up, but it is more associated with leisure time and not specifically loosening a grip. C) Slacken means to make or become less tight, tense, or firm and could also pertain to loosening a grip, whereas D) Release means to allow something to move, act, or flow freely and is more associated with letting go than specifically relaxing or easing.