The correct option is C p-2, q-4, r-1, s-3
Monoecious plants are those that have both male and female reproductive structures in the same plant. Such plants are also called bisexual plants. Example: Cucurbits, coconut, etc.
In dioecious plants, male and female reproductive parts are not present on the same plant but are present separately on different plants. They are also called unisexual plants.
Example: Papaya, date palm, etc.
Unisexual animals are those that possess either male or female reproductive parts, for example, cockroach, frog, elephant, humans, etc.
Bisexual animals are those that possess both male and female reproductive parts within the same individual. Example: Earthworm, sponge, tapeworm, leech, etc.