Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

An investor purchased 5,000 stocks at 57 dollars on margin. The initial margin he deposited to his broker is 40%. The broker will make a margin call when the margin account is less than 25%. The price that will cause a margin call is closest to:
Option A:30.0.
Option B:45.6.
Option C:23.0.

Answer: B