Under Which of These Circumstances Will the Magnetic Flux Through

Under which of these circumstances will the magnetic flux through a loop perpendicular to a uniform magnetic field change?

A) if the loop is replaced by two loops, each of which has half the area of the original loop
B) if the loop moves at constant velocity while remaining perpendicular to and within the uniform magnetic field
C) if the loop is rotated through 180 degrees about an axis through its centre and in the plane of the loop
D) if the loop moves at constant velocity in a direction parallel to the axis of the loop while remaining in the uniform magnetic field