Which one of the following is an aggregate fruit?

✅Explanation:
An aggregate fruit develops from a single flower with multiple ovaries. Each ovary develops into a tiny fruitlet, and these fruitlets cluster together on a single receptacle. In strawberries, the fleshy, red part we eat is the receptacle, while the tiny "seeds" on the surface are the actual fruitlets (achenes).

🛑Other Options Explanations:
-Option B: Pineapple: Pineapple is a multiple fruit, formed from the fusion of many flowers (inflorescence) into a single fleshy fruit.
-Option C: Guava: Guava is a simple fruit, developing from a single ovary of a single flower.
-Option D: Citrus: Citrus fruits (like oranges, lemons, etc.) are hesperidiums, a type of modified berry with a leathery rind and juicy interior.