The Following Questions Refer to the Description Below

The following questions refer to the description below.
Terry catches a ray-finned fish from the ocean and notices that attached to its flank is an equally long, snakelike organism. The attached organism has no external segmentation, no scales, a round mouth surrounded by a sucker, and two small eyes. Terry thinks it might be a marine leech, a hagfish, or a lamprey.
-Which feature excludes the organism from possibly being a leech?

A) elongated shape
B) lack of scales
C) lack of external segmentation
D) round mouth
E) anterior sucker