The correct option is B Multicarpellary apocarpous gynoecicum
An aggregate fruit is the one that develops from multicarpellary apocarpous gynoecium which means that there are many fused carpels present in the flower of that fruit.
In apocarpous ovary, each carpel is separated from one another and hence, forms a fruitlet which makes a bunch of fruitlets known as etaerio.
Examples of aggregate fruit are strawberries and blackberries. So, the correct answer is 'Multicarpellary apocarpous gynoecium'.