The correct option is B Multicarpellary apocarpous gynoecium
Gynoecium with multiple pistils are called multicarpellary. If the pistils are free, they are called apocarpous and if the pistils are fused, it is called syncarpous.
Aggregate fruit develops when each free ovary becomes a fruitlet and remains attached to each other, eg., raspberry, blackberry and strawberry. Hence, an aggregate fruit develops from multicarpellary apocarpous gynoecium.