Two equivalents of methyl magnesium bromide will add to ________.

A) lactones
B) aldehydes
C) ketones
D) imines
E) secondary amines

Lactones, which are cyclic esters, can react with two equivalents of Grignard reagents like methyl magnesium bromide. The first equivalent opens the lactone ring, converting it into a tertiary alcohol, and the second equivalent reacts with the newly formed ester, leading to the formation of a tertiary alcohol.