Urinary Catheters Pose Risks of Causing Urinary Tract Infections Because

Urinary catheters pose risks of causing urinary tract infections because

A) they block urine flow out of the bladder.
B) they block urine flow out of the bladder and they can introduce bacteria from the skin, anal, or external genital areas into the bladder.
C) they can introduce bacteria from the skin, anal, or external genital areas into the bladder.
D) they provide a surface for bacterial biofilms to establish and they can introduce bacteria from the skin, anal, or external genital areas into the bladder.
E) they provide a surface for bacterial biofilms to establish.