FIND [H] of a 0.001M solution of NaOH?

Question

I don't know if the text book give the wrong ans or something , bc they give me the correct ans is 10^-14M

These are the 4 choice they provide:

A 10^-3M

B 10^-9M

C 10^-11M

D10^-14M

Would ya be kind enough to explain why D is correct ???

Answer 1

D isn't correct.  Do it the easy way

[OH] = 1X10^-3, so pOH = 3

if pOH = 3, pH = 11

if pH = 11, [H] = 1X10^-11