The Parts of a Renal Tubule, in the Order in Which

The parts of a renal tubule, in the order in which filtrate flows through them, are:
1) loop of Henle
2) distal convoluted tubule
3) proximal convoluted tubule
"4) collecting tubule

A) 2, 1, 3, 4
B) 1, 2, 4, 3
C) 3, 2, 1, 4
D) 3, 1, 2, 4"