To solve this problem, we need to understand the concept of aggregate fruits and the type of gynoecium they develop from.$\newline \bullet$Aggregate fruits are formed from a single flower that has multiple, separate (free) carpels.$\newline \bullet$Each carpel develops into a small fruitlet, and together they form the aggregate fruit.$\newline \bullet$This type of gynoecium is known as multicarpellary apocarpous gynoecium.$\newline \bullet$In contrast, a multicarpellary syncarpous gynoecium has fused carpels, which do not form aggregate fruits.$\newline \bullet$A complete inflorescence refers to a group of flowers, not a single flower, and does not form aggregate fruits.$\newline \bullet$A multicarpellary superior ovary refers to the position of the ovary, not the arrangement of carpels.$\newline$Therefore, the correct option is Option 2: Multicarpellary apocarpous gynoecium.