Answer: Natural experiment
Explanation:
Natural experiment are the experiments that has to do with observing and taking note of an individual's experience under experimental and controlled conditions, these conditions are natural and uncontrollable by the one carrying out the experiment. It is an observational studies and is not controlled like every other random experiments.
According to the question i’m gonna have to proceed with choosing, true.
What is your question i don’t understand
Anne frank is a very import character, her and her family were stuck in a secret room for about 2 years. they got caught and her father found her diary and felt guilt.