Answer
Readings, greatest to least: B, C, A.
Work Step by Step
Faraday's Law states that the voltage induced in a coil is proportional to the number of loops in the coil, multiplied by the area of each of those loops, multiplied by the rate at which the magnetic field changes within those loops.
This is discussed on page 472.
Case B has 1 magnet and 5 coils of wire.
Case C has 2 magnets and 2 coils of wire. Two times two is less than 1 times 5.
Case A has 1 magnet and 3 coils of wire. One times three is less than 2 times 2.
