Kevin, a Contractor, Authorized Toby to Conclude Contracts for Home

Kevin, a contractor, authorized Toby to conclude contracts for home renovation on his behalf. Each time Toby met with a potential customer, he would advise the customer that he was acting on behalf of Kevin. Toby concluded a contract with Myra to renovate her home for $1,000. On finding out about the contract, Kevin refused to carry out the renovation as he believed that the price agreed upon was too low. Which of the following statements is TRUE?

A) If Kevin refuses to do the work, Myra can sue him for breach of contract.
B) Kevin is free to increase the price charged under the contract.
C) Myra can sue both Kevin and Toby if Kevin refuses to perform the contract.
D) If Kevin refuses to perform under the contract, Toby must complete the home renovations himself.
E) Myra cannot sue Kevin for breach of contract as the contract was concluded with Toby.