A square metal frame of side 0.20m is initially held with its plane perpendicular to a uniform magnetic field of 0.40T directed normally into the plane of the frame. The frame is quickly rotated through 90∘ about one of its sides in 0.10s. Neglecting resistance, the magnitude of the average induced emf and the sense of the induced current (as seen from the original position) are
(a) 0.16V, anticlockwise
(b) 0.08V, clockwise
(c) 0.16V, clockwise
(d) 0.25V, clockwise