ANswer is option A.
Start from inner queries.
from the first inner query. You get did ={22,22,31,31,64}
from the second inner query. You get did={22,31,74}
now intesect operaion you get : {22,31}
Finally, the outer query selects driver names whose did = {22,31}
hence the o/p is :{Karthikeyan, Boris}