Mary owns an attractive diamond ring that she originally purchased for $2, 500. Unfortunately, Mary was required to raise cash on short notice, and therefore, sold her ring to Anna for $1500. a. This is not a binding contract because Anna received a benefit. b. This is not a binding contract because Mary's detriment was excessive and unlawful. c. This is a binding contract supported by legally sufficient consideration. d. We cannot determine if a binding contract existed because a court must assess Mary's wisdom, considering all relative factors, in determining if the price constituted valid consideration