Answer:
d. Two of these but not all three
Step-by-step explanation:
From the information given above, there was a pre-existing contract between Harold and Isaac regarding to the gloves. This shows that, irrespective of issues that may come up, the contract agreement on the prices and quantity is still binding on them.
Also, if Isaac agrees to accept the $600 from Harold to settle the dispute and/or decided to sue for his remaining balance, it is still correct within the contract he entered into with Harold.