While a magnet is moved toward the end of a solenoid, avoltage differnce is induced between the two ends of the solenoid wire. The volatage difference would be larger if
a. the speed of the magnet were increased
b. the solenoid contained more loops (while having the samelength)
c. the bar magnet produced a stronger magnetic field
d all of the above statements are true
e. only two of the above statements are true.