6 What is the most effective way to revise sentence 21?

21) Also consider that chemicals are released by these many bottles when they are
discarded into landfills over hundreds of years and decompose.
A) Also consider that many bottles are discarded into landfills, where the bottles release chemicals as they decompose over hundreds of years.
B) Also consider that landfills are filled with released chemicals, where they decompose many discarded bottles over hundreds of years.
C) These bottles, decomposing over hundreds of years, should also be considered to release chemicals where they have been discarded into landfills.
D) Over hundreds of years, landfills are filled with many bottles, and it should also be considered that the bottles decompose and release chemicals.