Witch one would it be

A. Pipette
B. Volumetric flask
C. Electronic balance
D. Temperature probe

I think it’s c don’t get made if it’s not

C. Electronic balance

Explanation:

Pipette is a laboratory tool used in the measure of liquid substances. It is common with titration experiments.

Volumetric flask is a flask with readings for measurement. It measures large amounts of liquid.

Electronic balance deals with measuring the amount of mass contained in a substance. This is done by placing the substance on the balance and noting down the mass in grams.

Hard to tell without the whole question but the independent variable is the thing that changes between the groups. So if they were testing elephant behavior whether there was a mouse or no mouse, then that would be the independent variable.