As a reward for giving him the answer that will save his life, the old woman demands

a. a large sum of money

c. to marry the knight

b. to learn the secret of youth

d. to be pardoned by the queen

I can answer this question because I know what book you're talking about. The answer is c. But ultimately King Auther pawns off marrying the old woman to one of his knights, but it was his loss because the knight found out she turned into a young, hot woman at night ...