Jonah hired Marty, who is 16 years old, as his agent to buy up to a maximum of 50 used Dell 101 model laptops at a price of $200 each, or less. Marty bought 30 used Dell 101 model laptops for $100-200 using a written contract. Jonah was pleased with the laptops and accepted the contract and paid for the 20 laptops.

Marty then bought 25 more Dell 101 model laptops for $150 each on Jonah's behalf. Marty signed a written contract for the purchase of these 25 laptops with the seller, Used Tech, Inc. Jonah refused to accept and pay for these 25 laptops. What reason would justify Jonah's refusal to pay for the laptops and honor the contract with Used Tech, Inc.?

A. The contract with Used Tech is illegal because Marty is a minor.

B. There is no justification, the contract with Used Tech is valid because Marty signed a contract with Used Tech for the purchase of the 25 laptops.

C. The contract with Used Tech for the 25 laptops is voidable because Marty acted outside the scope of the agency agreement with Jonah.

D. This contract is voidable under the UCC because Marty is not a merchant.