The correct answer is D. Nephew.
Akash’s father’s wife is his stepmother. The daughter of Akash’s stepmother is his stepsister. The two brothers of Akash’s stepsister are his step-uncles. The younger of Akash’s step-uncles is Akash’s nephew.
Here is a diagram to illustrate the relationships:
[Diagram of Akash’s family tree]
Akash’s father is married to a woman who has two sons. These sons are Akash’s step-uncles. The younger of Akash’s step-uncles has a son, who is Akash’s nephew.