Which Describes a Plant Species with Perfect Flowers

Which describes a plant species with perfect flowers?

A) Individuals of a plant have flowers that contain either female structures or male structures but not both, yet both types of flowers can be found on the same individual.
B) Some individual plants have flowers that contain only female structures, and other separate individuals have flowers that contain only male structures.
C) Individual plants have flowers that contain neither female nor male structures.
D) Individual plants have flowers that contain both female and male structures.