Answer:
a. demand assurances of performance from Massive.
Explanation:
When Silas Paving Co finds out about the sale of Massive Earthmovers assets to Phoenix Equipment corp, it should find out from Massive if there is still assurance of performance on their contract. If assurance is given by Massive that the contract still holds then Silas Paving Co does not need to worry.
If however there is no assurance from Massive then Silas will be able to take action against Massive for breach of contract.