In each of the following questions, a sentence with four highlighted words has been given. One of these highlighted words may or may not have been used unnecessarily in the given sentences. You are required to choose the word that is redundant and gives a superfluous meaning. If all of the highlighted words are essential for the contextual meaning of the sentence, then choose option (e) as your answer choice.

Water-conservation and water-harvesting methods (A) that do not require the construction (B) of a dam are fallacious approaches (C) that have not been adequately (D) examined in the management of water resources.

The correct answer is D.

To identify the word that is redundant or contextually superfluous, let us break down the sentence and analyze its logical coherence:
"Water-conservation and water-harvesting methods (A) that do not require the construction (B) of a dam are fallacious approaches (C) that have not been adequately (D) examined in the management of water resources."

Step 1: Analyze the grammatical role of each highlighted word
- methods (A): A noun referring to the techniques of water-conservation and water-harvesting. This is essential to specify what is being discussed.
- construction (B): A noun indicating the building of a dam, which is necessary to describe the nature of these methods.
- approaches (C): A noun that acts as a synonym/referent for the methods, linking the subject to the relative clause.
- adequately (D): An adverb modifying the verb "examined."

Step 2: Examine the logical relationship and find the redundancy
The sentence describes the methods as "fallacious approaches." The word fallacious means based on a mistaken belief, false, or faulty. If these approaches are definitively declared to be fallacious, it implies their flawed nature is already a known fact.
However, the sentence then qualifies them as having "not been adequately examined." If they have not been sufficiently or adequately examined, it is logically inconsistent to conclusively label them as "fallacious." Thus, the adverb adequately is superfluous and redundant in this context because it conflicts with the definitive claim made by the word "fallacious," making the sentence logically sounder and cleaner without it.