How did Pasteur help to disprove spontaneous generation? a. He discovered that only bacteria and flies grow through spontaneous

How did Pasteur help to disprove spontaneous generation?

a. He discovered that only bacteria and flies grow through spontaneous generation.
b. He examined covered and uncovered meat and determined that maggots come from eggs.
c. He determined that air was not necessary to cause meat to rot and spoil.
d. He showed that liquids would only grow bacteria when other bacteria were first present.