The correct option is A Drupe
The ovary transforms into fruit after fertilization.
A fruit consists of a fruit wall or pericarp and seeds.
In fleshy fruits, the pericarp is fleshy and differentiated into an outer epicarp, middle mesocarp and an inner endocarp.
In coconut, the fruit develops from monocarpellary superior ovary and is single seeded.
The epicarp is thick and green, mesocarp is fibrous and inner endocarp is hard and stony. This type of fruit is called drupe. Drupes are characterized by a stony endocarp.
Berry is a simple fleshy fruit that usually has many seeds.
Capsule and nut are dry fruits in which the pericarp (fruit wall) is dry and undifferentiated.