A________is an example of a compound fruit.

a. blackberry
b. pineapple
c. both a and b

To determine which option is an example of a compound fruit, let's first understand what a compound fruit is.

Compound fruit is a type of fruit that develops from multiple ovaries in a single flower. It is a fruit made up of a cluster of smaller fruits, also known as drupes or simple fruits.

Now, let's analyze the given options:

a. Blackberry: A blackberry is a compound fruit. It is formed from several small drupelets that are clustered together to form a single fruit.

b. Pineapple: A pineapple, on the other hand, is not a compound fruit. It is a multiple fruit, which means it develops from several individual flowers fused together on a single stalk. Each "eye" on a pineapple is a separate flower that has fused together.

c. Both a and b: This option is partially correct. While blackberry is a compound fruit, pineapple is not. Therefore, the correct answer is just option a: blackberry.

So, the correct answer is a. Blackberry.