THE CORRECT ANSWER IS E. THE ORIGINAL SENTENCE CONTAINS THE PHRASE...

41. The correct answer is E.

The original sentence contains the phrase "ordered that", which

requires a clause containing the subjunctive. However, the original

sentence has "should" instead. Moreover, it is illogical to test a lake

or stream "for mercury levels". Instead, one tests the mercury

levels of the lake or stream.

The only choice to address all these issues is E.