Bailey Agrees to Bathe and Groom Keiko's Dog, Fluffy, for $30

Multiple Choice

Bailey agrees to bathe and groom Keiko's dog, Fluffy, for $30. Bailey agreed to the price prior to seeing Fluffy, who is a large dog with lots of hair. Bailey tells Keiko that if she is going to groom Fluffy, the price will be $40. Keiko reluctantly agrees but tells Bailey that she should not have been surprised that a dog named Fluffy would have lots of hair. Bailey bathes and grooms Fluffy, but Keiko only pays her $30. Which of the following is correct regarding Bailey's entitlement to the extra $10?

A) Bailey is entitled to the extra $10 because a valid bilateral contract existed.
B) Bailey is entitled to the extra $10 because a valid unilateral contract existed.
C) Assuming the unforeseen circumstances rule does not apply, Bailey is not entitled to the extra $10 because she had a preexisting duty to bathe and groom Fluffy for $30.
D) Assuming the unforeseen circumstances rule does not apply, Bailey is not entitled to the extra $10 because Keiko's promise to pay $30 was illusory.
E) Assuming the unforeseen circumstances rule does not apply, Bailey is not entitled to the extra $10 because past consideration was involved.