What physical property of the metal rods was being tested during step 4 of the procudure? 4. Measure and record how long it takes heat from the hot plate set on "high" to melt the wax ball.

A.
magnetism
B.
thermal conductivity
C.
electrical conductivity
D.
density

B.  thermal conductivity

Explanation:

They physical property being tested during the fourth step is the thermal conductivity of the materials.

Thermal conductivity is the ability of a body to transmit heat energy from one place to another.

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a