On May $1,2015,$ Mint a $16-$year old, purchased a sailboat from Sly Boats. Mint used the boat for six months at which time he advertised it for sale. Which of the following statements is correct?

a$.$

The sale of the boat to Mint was void, thereby requiring Mint to return the boat and Sly to return the money received.

b$.$

The sale of the boat to Mint may be avoided by Sly at its option.

c$.$

Mint's use of the boat for six months after the sale on May $1$ constituted a ratification of that contract.

d$.$

Mint may disaffirm the May $1$ contract at any time prior to reaching majority.