To Reduce the Ache in Your Knees When You Work

To reduce the ache in your knees when you work out, you buy an elastic knee brace from the pharmacy section at the grocery store. This transaction differs from paying a surgeon to replace your knee joint because

A) the price of the knee brace is the same at all the local markets; however, the price for a knee replacement cannot be determined.
B) the knee brace is basically the same product regardless of where you buy it or who you buy it for, even though there may be different manufacturer brand names. However, each knee replacement surgery is different, and its specifics vary according to the individual patient's needs and the individual physicians' assessment and skills.
C) you are able to pay for the purchase of the knee brace from your health savings account.
D) you require a physician's expertise to determine your need for the knee brace.
E) you expect that the transaction will result in alleviating your pain.