In a One-Period Binomial Model,assume That the Current Stock Price $- 0.50$

Multiple Choice

In a one-period binomial model,assume that the current stock price is $100,and that it will rise to $110 or fall to $90 after one month.What is the delta of a 99-strike one-month put option?

A) $- 0.50$
B) $- 0.45$
C) $+ 0.45$
D) $+ 0.50$