Respuesta :
The best answer out of your given options would most likely be the letter A due to the unfair conditions. Never make a deal unless you are actually getting a fair or better gain then the person your trading with. In this case you cannot expect to get the materials without a fair raise in what he is paying you. Otherwise tell him to forget and you will make a deal with his competitors. If this fails to get his attention then just join his competitors so that you can get a better deal and more cash. Plus losing you will hurt him like the loss of any business investment does.