Barb has bipolar disorder and when properly medicated is able to understand the provisions of a contract to purchase a home. Under the contractual capacity requirement her home purchase contract may be void if

a). Barb requests for changes to be made to the home
b). if the seller decided he didn't like the price.
c). Barb failed to take her medication on the day she signed the contract
d). it was raining heavily on the day of the contract signing