Why Is It So Difficult to Kill Acid- Fast Bacteria

Why is it so difficult to kill acid- fast bacteria?

A) The bacteria are very motile and can travel to areas with a lower concentration of hazardous chemicals.
B) Mycolic acid makes it very difficult for nutrients and gases to enter or exit cells.
C) The acid in the bacteria denatures most antibiotics before they can work.
D) They are just as difficult to kill as Gram- positive bacteria.
E) The bacteria are able to quickly break down several types of antibiotics before the concentration can reach dangerous levels.