(A) are generally found in the waters off industrial shorelines, but have been discovered in trace amounts even - Correct. Heavy metals after 'but' is understood and hence it can be ignored.
(B) are generallyto be found in the waters off industrial shorelines,and have even been discovered in trace amounts - Incorrect. 'to' introduces a needless infinitive + 'and' Changes meaning.
(C) can, in general, be found in the waters off industrial shorelines, and have been discovered in trace amounts
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(B) are generallyto be found in the waters off industrial shorelines,and have even been discovered in trace amounts - Incorrect. 'to' introduces a needless infinitive + 'and' Changes meaning.
(C) can, in general, be found in the waters off industrial shorelines, and have been discovered in trace amounts
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