Fay, Age 17, Ordered a Pair of Skis on the Installment

Fay, age 17, ordered a pair of skis on the installment plan. She paid $20 every month until she turned 18, the age of majority. The next day, she sold the skis to Sharon and disaffirmed the contract. Fay is:

A) still liable since she had to disaffirm before her 18th birthday.
B) still liable because selling the skis amounted to a ratification.
C) still liable because she used the skis.
D) not liable because skis are not necessaries.