Can someone please help me answer these 2 bio questions?

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The purpose of the experimental group(s) in an experiment is to Select one: a. Assess if the experimental system (assay) is working as expected b Test the hypothesis c. Eliminate confounding variables d. Measure the dependent variable e. Measure the independent variable If your experimental system (assay) is working as expected, then in which of the following should you see the the measured effect or significantly more of the measured effect (e.g. a change in % cell viability)? Select one: a. The positive control only b. The negative control only c. Both the negative and positive controls d. The experimental group samples e. The experimental group and the control samples group samples