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

Without more information about the specific experiment and what was being tested, it is difficult to determine the most likely explanation for the failed experiment. However, of the given options, option c (the wire was not connected properly) is a common issue that could cause an experiment to fail. It is important to ensure all connections are secure and properly attached before conducting an experiment.