10 points chem question help please

Choose the pair of concentrations that cannot be in a given aqueous solution at 25°C.

A. [H+] = 10 M, [OH–] = 10-15 M

B. [H+] = 10-7 M, [OH–] = 10-7 M

C. All of these can exist.

D. [H+] = 10-13 M, [OH–] = 10-1 M

E. [H+] = 10-3 M, [OH–] = 10-11 M

I don't see a reason why any of these shouldn't be able to exist. These are essentially just solutions with varying ranges of acidity and basicity. A solution can have any pH so I would choose the answer C.

They can all exists. [H+]*[OH-] always equals 10^-14. The first choice is the same as 10^1, which multiplied by the OH- concentration still gives 10^-14. But keep me as far away from that solution as possible..

The answer's B.

C