Do Epidemiologists Perform Planned Scientific Experiments with Rigorous Controlled Experimentation

Do epidemiologists perform planned scientific experiments with rigorous controlled experimentation?

A) Yes,they work in labs and perform lab experiments to prove their hypothesis.
B) Yes,they use the standard scientific method.
C) No,they only form a hypothesis but do not analyze or compile any data.
D) No,they examine data that have already been compiled and look for patterns.
E) No,they only do uncontrolled experiments.