Option C : α (q3,bab) is {q0, q1, q2, q3}
Considering the below ε-NFA , state q3 on i/p 'b' makes a transition to state q2 and then from state q2 on epsilon transition we can reach to q0 & from there on i/p 'a' state q0 reaches to q1 & at last on i/p 'b' state q1 makes a transition to state q3.
Transition : bεab => bab (since, ε.R = R.ε = R )