Jan's Aunt Writes a Letter to Jan,offering to Give Her

Jan's aunt writes a letter to Jan,offering to give her a new car.Jan takes the car,but after two months her aunt asks for the car back.Jan refuses and her aunt sues her,claiming there was no contract and therefore it was still her property.Which of the following statements is true?

A) Jan should write "seal" on the letter to substitute consideration.
B) Jan should argue a promissory estoppel because she had relied on the letter when accepting the car.
C) Jan cannot argue a promissory estoppel because she did not share a legal relationship with her aunt.
D) Jan could not have used a seal if her family did not have a crest.
E) Jan must return the car because she gave no consideration.