13. Which procedure would most likely provide valid results in a test to determine if drug A would be effective in treati cancer in white mice?
A) injecting 1 mL of drug A into 100 white mice with cancer
B) injecting 1 mL of drug A into 100 white mice with cancer and 0.5 mL of drug X into 100 white mice without can
C) injecting 1 mL of drug A into 100 white mice with cancer and 0.5 mL of drug X into another group of 100 white
with cancer
D) injecting 1 mL of drug A into 100 white mice with cancer and 1 mL of distilled water into another group of 100
mice with cancer