Question

When a scientific experiment is carried out in a controlled setting, all variables are kept the same except for the _______ variable.

A) environmental
B) observational
C) control
D) experimental

Answer 1

When a scientific experiment is carried out in a controlled setting, all variables are kept the same except for the _control______ variable
control variable is something that is kept constant and is unchangeable
so i conclude option C is correct
hope it helps

Answer 2

The correct answer is D) experimental

Hence the name, experimental. Everything stays the same except for the one changed variable that makes it an experiment.