Francesco Redi Performed the Following Experiment

Francesco Redi performed the following experiment. He had two different sets of containers with meat in them. One set of containers was covered with a material that let air pass through and the other set was left uncovered. The uncovered containers developed maggots and the covered ones did not. Which one of the following hypotheses could not be tested by this experiment?

A) Maggots come from within the meat.
B) Maggots are introduced to the meat from some outside source.
C) Only living things can give rise to other living things.
D) Air is necessary for living things to be produced.