The sentence contains a comparison between the way recreational divers explore wrecks and the way government concerns analyze them. The first three choices use the word "unlike" at the beginning of the sentence, while the final two place "whereas" after the comma. There is nothing inherently right or wrong about either option; the important thing is that the items being compared are parallel.

Choice (A) is wrong, as "exploring" should be compared with "analyzing." (B) is incorrect: "wrecks" is not parallel to "exploring." (C) places "recreational divers" after "unlike," so "government concerns" should follow the comma, but it does not. (D) is parallel: "recreational divers" are compared with "government concerns." (E) is parallel, but the pronoun "they" is ambiguous. It could refer to wrecks, divers, or government concerns. Choice (D) is correct.