(b) Litchi is the correct answer.
The edible part of the litchi fruit is the juicy aril. An aril, also known as an arillus, is any specialised funiculus outgrowth that covers or is attached to the seed. The term is sometimes used to refer to any fleshy appendage of a seed in a flowering plant, such as the mace of a nutmeg seed. The aril has the potential to form a fruit-like structure.
False fruits are found in a wide range of angiosperm taxa. Rather than a pericarp layer, the edible flesh of longan, lychee, ackee, and lleuque fruits are highly developed arils surrounding the seed. Arils of this type can also be found in a few gymnosperm species.
As a result, option b is the correct answer.