Amy is doing a science experiment on how certain bacterium reacts to an antibiotic. She has 3 dishes of identical bacterium samples with 14 bacteria in each dish. She gives an antibiotic to all of the bacteria in one dish. All of the treated bacteria died, and the bacteria in the other two dishes survived.

What type of sampling is demonstrated in the situation above?

A) Negative sampling

B) Random sampling

C) Census

D) Convenience sampling