The correct option is C Composite fruit
Mulberry is a fleshy multiple or composite fruit, the fruit is formed from flowers that are crowded together on a fleshy stem. The mulberry fruit is a multiple fruit - a sorosis. Immature fruits are white, green, or pale yellow. In most species, the fruits turn pink and then red while ripening, then dark purple or black, and have a sweet flavour when fully ripe.
Thus, the correct answer is option C.