A．A hypothesis is described, challenged by a second hypothesis, then disproved by research.
B．A hypothesis is described, then confirmed by research, disproving a second hypothesis.
C．A hypothesis is described, then established by research, then replaced by a second hypothesis.
D．A hypothesis is described, then modified through research, then compared with a second hypothesis.
E．A hypothesis is described, then abandoned after research, and replaced with a second hypothesis.