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