The characteristics that distinguish phylum Annelida worms from simple worms include(s)
A. nephridia, a heart, and, in some cases, jaws.
B. the lack of a true digestive system.
C. metamerism.
D. nephridia, a heart, metamerism and, in some cases, jaws.

D. nephridia, a heart, metamerism and, in some cases, jaws.

Explanation:

Since the organism in Phylum Annelida worms and simple worms seems very common but they have may differences, which are as following:

Nephridia: Nephridia are the paired excretory organs that occur in the Annelida phylum. They discharge metabolic water from the body, I is not present in simple worms as roundworms.Heart: aortic arches are present in earthworms (Annelida), which pump blood out into the network of vessels that run in a circuit through the body. Metamerism: Metarism defines the segmented body characteristic of annelids which is not found in other simple worms. It is easily visisble in earthworms.

Hence, the correct answer is D.

D. peatlands,grassland,swamps