Karen Decided to Sell Her Stair Step Exerciser, Because She

Karen decided to sell her stair step exerciser, because she wasn't using it as much as she thought she would.Her friend Lydia bought it from Karen for $100.The first day that Lydia used the exerciser, it fell apart, injuring Lydia's ankle.In this situation:

A) Lydia can sue Karen for breach of the warranty of merchantability, because the exerciser is not fit for the ordinary purpose intended.
B) Karen can sue the manufacturer for breach of the warranty of merchantability, because she was the original buyer.
C) Lydia cannot sue Karen for the warranty of merchantability because Karen is not a merchant.
D) Lydia cannot sue Karen, because they are not in privity of contract.