Answer:
Subsequent illegality of the subject matter.
Step-by-step explanation:
In this case the subject matter of the agreement is related to an illegality.
Tracy has offered Liam a job but before Liam accepts there is a change in The state law. Since the specific subject matter of the offer is destroyed before the offer is accepted by Liam, there is an automatic termination of the offer. Such that Liam cannot perform his duties because the terms of the agreement are illegal. Due to a change in law, the performance of the job becomes illegal