To Compute the Value of a Put Using the Black-Scholes

To compute the value of a put using the Black-Scholes option pricing model, you:

A) first have to apply the put-call parity relationship.
B) first have to compute the value of the put as if it is a call.
C) compute the value of an equivalent call and then subtract that value from one.
D) compute the value of an equivalent call and then subtract that value from the market price
Of the share.
E) compute the value of an equivalent call and then multiply that value by e-RT.