[Dog Training] Nia and Bruno Enter into a Written Contract

Multiple Choice

[Dog Training] Nia and Bruno enter into a written contract for Bruno to train Nia's dog. Under the contract, Nia is required to pay Bruno $20 for each training session.
-Bertrand sends an email to Lowell asking him if he would like to co-author a book. Lowell agrees and requests a $10,000 advance for the first three chapters. Bertrand sends him the money. Classify the contract.

A) The contract is voidable, express, and executed.
B) The contract is void, implied, and executory.
C) The contract is express, bilateral, and executory.
D) The contract is implied, executed, and valid.
E) There is not a valid contract.