Determine Which Property of Absolute Value Justifies the Statement $| - x | = | x |$

Multiple Choice

Determine which property of absolute value justifies the statement.
- $| - x | = | x |$

A) Property 2: the absolute value of a number and its opposite are equal.
B) Property 5: the triangle inequality
C) Property 2: the opposite of the absolute value of a number is equal to the absolute value of the number.
D) Property 1: the opposite of a number is equal to the absolute value of the number .