Which of the following is not true about sedimentary rocks?

Assuming that these are the answer choices, this should be correct:
 A. They are formed through compaction and cementation. 
B. They are made up of sediments. 
C. They are formed from igneous rock fragments.
D. They are not part of the rock cycle.

The answer should be D, they are not part of the rock cycle. 
Sedimentary rocks are most DEFINITELY part of the rock cycle. Sedimentary rocks are types of rock that are formed by the deposition and subsequent cementation of that material at the Earth's surface and within bodies of water.

Some examples include sandstone, limestone, and flint.
Hope this helps!!!:)

D. They are not part of the rock cycle.

2. they have negligible mass.