The modulus gives the absolute value of the number (without the sign). That is
[tex]\begin{gathered} |-a|=a \\ |a|=a \end{gathered}[/tex]So, let's evaluate each sentence.
A) |-20| < 20
20 < 20
FALSE
The right statement would be 20 = 20
B) |9| = 9
9 = 9
TRUE
C) |-20| > |9|
20 > 9
TRUE
D) |9| < |20|
9 < 20
TRUE
Answer: Sentence A is not true.
