A Stock Is Currently Trading at $50 $- 0.4355$ And the Gamma of the Put Is 0

Multiple Choice

A stock is currently trading at $50. A three-month at-the-money European put option on the stock costs 2.178. The delta of the put is $- 0.4355$ and the gamma of the put is 0.063. Given these values, if the stock price decreases by $5.00, then the best estimate for the new value of the put is

A) $4.35$ .
B) $5.14$ .
C) $0.79$ .
D) $3.57$ .
E) Zero.