The correct option is C Mesocarp
The mesocarp is the middle layer of the pericarp between the exocarp and endocarp. In mango, the mesocarp is the edible, fleshy portion that is eaten between the skin and the seed. This edible portion is the one that is, in common usage, associated with what is a fruit.
In young coconut, the mesocarp is relatively soft but becomes the dry and fibrous husk of the mature fruit. So, edible part of mango is mesocarp and not epicarp and endocarp.
Therefore, the correct answer is option C.