Question was answered correctly by rolling circle.And someone else mentioned the illusion thing ,where the ground speed increase's and an inexperienced pilot may slow the airplane down and enter a stall in the next turn as the wing is loaded in the turn,made even worse if the turn is skidding.
Attitude And Awareness will prevent most problems.
If the question was "At what angle of bank does the airspeed change ?' the answer would be different.
Aristotle said "Finding the question is harder than the answer".