Stewart entered into a contract with Will to have Will build a $10-$unit apartment complex on Elm Street in Randolph County. Unknown to both parties, this land had recently been rezoned and only single$-$unit dwellings can be constructed. In this case:

a$.$ since everyone should know the law, Stewart is liable to Will for any losses he may incur.

b$.$ Will is liable to Stewart since Will is a contractor.

c$.$ Stewart is obligated to buy land elsewhere and have the complex constructed on property zoned for apartments.

d$.$ there is a mistake of law, which in some states is treated no differently than a mistake of fact. In such states, since this mistake relates to a basic assumption on which the parties made their contract and it has a material effect on their agreement, the contract is voidable.