When Nucleophilic Addition to a Carbonyl Group Occurs,the Carbon Attacked $\to$

When nucleophilic addition to a carbonyl group occurs,the carbon attacked undergoes this hybridization change:

A) sp² $\to$ sp³
B) sp $\to$ sp²
C) sp $\to$ sp³
D) sp³ $\to$ sp²
E) sp² $\to$ sp