Materials used table or desk
drum and drumsticks
laser pen
clothespin or binder clip (optional
lab stand and clamp
mirror or felxiable mirror
tape
large rock about 8 cm across
smaller rock
video camera to record(slow minton optional
graph paper
masking tape

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.

girl imma just put my comment here because i need a couple point okurrttt