Question

select the synonym of the word in bold. if a peach is firm, that means it isnt quite ripe yet. many types of fruit are hard until they ripen.

Explanation:

To find the synonym of "firm", we analyze the context. The sentence says a firm peach isn't ripe yet and many fruits are hard until ripe. So "hard" has a similar meaning to "firm" in this context.

Answer:

hard