Heavy metals seep from polluted waterways into...

The answer is B.

A. not only to disturb the reproductive systems of most fish, including salmon and tilapia, accumulate in the bodies of shellfish, such as clams and oysters, but also to pose
There's a lack of parallelism in the structure. The construction doesn't properly link the elements in a parallel structure.

B. not only to disturb the reproductive systems of most fish, including salmon and tilapia, and accumulate in the bodies of shellfish, such as clams and oysters, but also to pose
This option corrects the parallelism issue by connecting the two verbs ("disturb" and "accumulate") after "not only" and maintains coherence in presenting the consequences of heavy metals seeping into waterways.

C. for not only disturbing the reproductive systems of most fish, like salmon and tilapia, and accumulating in the bodies of shellfish, like clams and oysters, but posing also
The use of "for" disrupts the structure and flow of the sentence. Also, the construction with "for" is not coherent with the intended meaning of the sentence.

D. for disturbing not only the reproductive systems of most fish, including salmon and tilapia, and for accumulating in the bodies of shellfish, including clams and oysters, but also for posing
Similar to option C, the use of "for" creates awkwardness and disrupts the parallelism in the sentence, making it less clear and concise.

E. not only to disturb the reproductive systems of most fish, including salmon and tilapia, to accumulate in the bodies of shellfish, such as clams and oysters, but also to pose
This option lacks the parallel structure needed to properly connect the elements in the sentence. The structure creates ambiguity and does not convey the intended meaning effectively.