A school class went on a field trip to see a magician perform.There were 17 females and 20 males in the class.The magician randomly selected a volunteer from the audience, which had 52 females and 68 males.Given that the randomly selected audience member is a student from the class, which equation can be used to find the probability,P, that the person is also a female?

A: P = 17/120 37/120

B: P = (17/120) ( 37/120)

C: P = (17/20) (52/68)

D: P = 17/20 52/68