Answer:
The correct answer is a. Sue for breach of contract and seek legal remedy.
Step-by-step explanation:
First of all, a contract can also be verbal and it gives the same rights and obligations to both sides as if it was written, so when Sam accepted Bradley's offer of $500.000 he contracted many obligations that he clearly later breached, therefore what Bradley should do is sue for breach of contract (because of what i stated above) and seek for legal remedy.