Liz agrees to cook twenty dinners for brian, in exchange for which brian will repair all of the plumbing in liz's house. liz has offered legally: a. sufficient consideration, because liz has promised something of value. b. insufficient consideration, because cooking twenty dinners is not worth as much as repairing all of the plumbing in liz's house. c. insufficient consideration, because there is a clear lack of any bargain. d. insufficient consideration, because this kind of bargain is against public policy.