You Buy an At-The-Money Chooser Option

You buy an at-the-money chooser option.Immediately after you buy it,the price of the underlying increases very sharply.Other things remaining the same,the value of your chooser likely

A) Increases.
B) Decreases (the put now has no value) .
C) Remains constant (the increase in call value is canceled out by the decrease in put value) .
D) Goes to zero.