An Equilateral Triangle Known as the Trigone of the Bladder

An equilateral triangle known as the trigone of the bladder is formed by the _____________.

A) two openings of the ureters and the opening of the urethra
B) ureters and the prostate gland
C) right and left kidneys and the bladder
D) bladder and the cervix of the uterus
E) none of the above