A sales representative knowingly entered into a contract for an alarm system during a door$-$to$-$door sales campaign with an obviously mentally$-$ill individual. Why could the contract be immediately rendered voidable at that individual customer's request?

Select one:

a$.$ the contract if contrary to the culpable silence provisions contained in the Vulnerable Persons Act

b$.$ the contract is unenforceable in accordance with the Unconscionable Transactions Relief Act

c$.$ establishing true consent is not possible due to the individual's incapacity to grasp the essence and effect of the contract

d$.$ the individual is lacking legal capacity and is unable to perform the contract in whole or in part