Pineapple (ananas) fruit develops from (a) a multilocular monocarpellary flower (b) a unilocular polycarpellary flower (c) a multipistillate syncarpous flower (d) a cluster of compactly borne flowers on a common axis.
Option D Pineapple is a sorosis type of fruit that develops from spike or spadix inflorescence. Here the flowers fuse by their succulent tepals and axis bearing the flowers becomes fleshy or woody, thus forming a compact mass. These are composite or multiple fruits. In pineapple fleshy axis, bracts, fused perianth and pericarp are edible.