The best translation for "Bananas are sold in the fruit store" is:
<em><u>Se venden bananas en la frutería</u></em>.
Explanation:
The options that were not taken into account were discarded for the following reasons:
Bananas son vende en la frutería: the sentence is not well constructed since the first verb "son" is good, the second verb "vende" <u>must be conjugated in its perfect form</u> "vendidas".
Venden bananas en la frutería: the sentence has no subject or object pronoun and, although in many cases it is not necessary in Spanish since the conjugate verb can say what the noun or personal pronoun is, in this case, there could be two options: "ustedes" and "ellos", so it looks incomplete.
Se venden bananas en la frutería: It's the most complete sentence and the direct translation of the sentence given.
