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Researchers are curious if there is a connection between childhood cancer rates and living near power lines.

What could be a viable way to investigate this relationship?

I. Randomly select $200\text{ children}$ and move half of them near power lines while ensuring the other half do not live near power lines then compare cancer rates.

II. Randomly select $100\text{ children}$ who live near power lines and another $100\text{ children}$ who do not live near power lines then investigate cancer rates of the respective groups.

III. Randomly select $100\text{ children}$ who have cancer and another $100\text{ children}$ who do not have cancer and compare where the children live.

A

I only.

B

II only.

C

I and II only.

D

II and III only.

E

I, II, and III.

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