Answer:
a. Missing conclusion, Our client has an enforceable contract
Step-by-step explanation:
The argument in this scenario, is a modus ponens and is missing its conclusion. Which in this case would be "Our client has an enforceable contract". It is a modus ponens because it has two pieces of logic that are connected and when one is true so is the other. In this scenario, the contract is in writing which is one piece of logic and is true, therefore, the other piece of logic should be true too.