Which of the following expressions is correct?
a: |-9| = |9|
b: -|-9| = |-9|
c: |-9| = -9
d: -|9| = 9

A. |-9| = 9 
Because when a number is between those lines, that means it's the absolute value of that number, or number of places from 0 on a number line. 

A because the absolute value of a negative number is its positive absolute value.