Answer:
The correct answer is : Yes, the contract is binding.
Step-by-step explanation:
While talking about contracts as proof of obligation from a certain party, the document not necessarily has to be official but there must be at least some sort of written evidence with the signature of both parties involved.
In the letter sent by Creshiem Garage, they recognized the oral agreement made with Martin and set the corresponding terms. So, if later on, Creshiem does not recognize the letter they are breaching the initial deal giving Martin the right to sue Creshiem since the letter the contract is binding.