AB * BE = CB * BD were given
so CB/BE = AB/BD ------------> property of proportion
<ABC = < DBE ------------> vertical angles
triangle ABC ~ triangle DBE ------------> SAS <span>Similarity propery</span>
It is a observation study, because you are observing how much rainfall is in Hawaii at 50 sites.
I believe the answer is A
II(RS is a median) and III(RS is a side of RST)
