Fess convinces Gwyn to enter into a contract for the purchase of a Falafel Waffle Food Cart by knowingly misrepresenting a number of material features about the facility and the business. Most likely, Gwyn can rescind the contract on the basis of

Most likely, Gwyn can rescind the contract on the basis of misrepresentation.

Explanation:

A contract is an agreement between two parties to engage in a business transaction. It happens to be a legal binding document when executed with signatures and probably witnesses.

But, in a situation where there is a misrepresentation of facts in the agreement document, it is a strong valid ground to render the document null and void. For Gwyn, she can rescind the contract on the basis of misrepresentation by Fess.