Why does the current in the copper loop have to change with time? $[$Select all options that apply by entering a string of letters. For example: If you believe X$,$ Y$,$ and Z are true, then enter $\text{'}$XYZ$\text{'}$ without the quotation marks.$]$

A$)$ A constant magnetic field would not do anything to the free electrons in the aluminium when it is at rest.

B$)$ Magnetic induction only occurs when magnetic fields change with time.

C$)$ Changing currents are required to overcome Ohm's law.

D$)$ The copper will get too hot if the current is held constant.