The samples that will change are A, B, C, D, and E. If you are wondering why F will not change, the answer to this is simple: the concentration levels are the same for letter F which means that there will be no change. All of the other given samples will have some changes because the concentration levels are not the same.
The severity of the change will just be different depending on the amounts that are available. It will be useful to double check the possible outcomes that may occur depending on the concentration levels of the given items.
If there is a difference in concentration, there will be a change in the content. All but one have differences. Only one wrong answer in this question.