Yolanda Agrees to Bathe and Groom Wendy's Dog Fluffy for $20.Yolanda

Multiple Choice

Yolanda agrees to bathe and groom Wendy's dog Fluffy for $20.Yolanda agreed to the price before seeing Fluffy,a very plump,grouchy Pembroke Welsh Corgi dog with lots of hair.Yolanda tells Wendy that if she is going to groom Fluffy,the price will be $30.Wendy agrees but exclaims in exasperation that the dog is,after all,named "Fluffy!" Yolanda bathes and grooms Fluffy,but Wendy will only pay $20.Which of the following is correct regarding Yolanda's entitlement to the extra $10?

A) Yolanda is entitled to the extra $10 because a valid bilateral contract existed.
B) Yolanda is entitled to the extra $10 because a valid unilateral contract existed.
C) Assuming the unforeseen circumstances rule is inapplicable,Yolanda is not entitled to the extra $10 because she had a preexisting duty to bathe and groom Fluffy for $20.
D) Assuming the unforeseen circumstances rule is inapplicable,Yolanda is not entitled to the extra $10 because Wendy's promise to pay $30 was illusory.
E) Assuming the unforeseen circumstances rule is inapplicable,Yolanda is not entitled to the extra $10 because past consideration was involved.