Mrs. Hankinson made the following electromagnet. What is the most likely explanation for the failed experiment?

a
The battery is too low voltage to work
b
The electromagnet needs a switch
c
The wire was not connected properly
d
The metallic objects lost their magnetic domains

It's difficult to determine without additional information about the experiment and what specifically "failed." However, based on the given options, the most likely explanation would be (c) the wire was not connected properly. If the wire was not properly connected, the circuit would not be complete and electricity could not flow, which would result in a non-functional electromagnet.