The correct option is A Coconut.
The seed coat helps protect the embryo from mechanical injury, predators and drying out. The seed coat develops from the material tissue, the integuments, originally surrounding the ovule. The seed coat in the mature seed can be a paper-thin layer (e.g. peanut, maize, gram) or more thick and hard in honey locust and coconut, or fleshy as in the sarcotesta of pomegranate.