Which list has the solutions placed in order of increasing OH- concentration

Given the following solutions:
Solution A: pH of 10
Solution B: pH of 8
Solution C: pH of 7

Which list has the solutions placed in order of increasing OH- concentration?
A) A, B, C
B) B, A, C
C) C, A, B
D) C, B, A

pH + pOH = 14
we have been given with pH so we can easily calculate pOH.
solution A, pOH = 14 - 10 = 4
solution B, pOH = 14 - 8 = 6
solution C, pOH = 14 - 7 = 7
now, we have another equation-
pOH = -log[OH-]
or, 10^-pOH = [OH-]
solution A, [OH-] = 10^-4
solution B, [OH-] = 10^-6
solution C, [OH-] = 10^-7
so, increasing order of concentrations is-
10^-7 < 10^-6 < 10^-4
that is, C < B < A
Hence the correct answer is D.

D

The higher the pH of a base is the stronger it is. A strong base is one that creates the highest OH- concentration in water.

Answer: D

C has the lowest [OH-] and A has the highest [OH-].