Three of these expressions give the distance between points a and b on the number line which expression does not

There of these expressions is the distance between point A and B, the answers are letter "B", letter "C" and letter "D". The solutions and explanations are shown below:
Why B?
B= |7.5+3.5 | = |7.5 - (-3.5)| = 11 units
Why C?
C =|-3.5 - 7.5| = |-11| = 11 units
Why D?
D= |7.5 - (-3.5)| = |7.5 +3.5|=|11| = 11 units

Ab=dc ac=de ad=bce i hope this !