Concept:A pair of words must be interchanged to make the sentence both grammatically and contextually correct.
Explanation:In the given sentence, position A should hold a noun because it acts as the subject of the clause “may seem like”.
Here, “unnecessary” is an adjective, not a noun, so it cannot correctly occupy position A.
Similarly, position D has “war”, but the phrase “most wars are war” is illogical and lacks a meaningful descriptive word.
Swapping the words at A and D makes the subject “war” and completes the idea with “unnecessary”.
The corrected sentence reads:
“While war may seem like a glorious way to sacrifice life, the truth is that most wars are unnecessary.”
This is grammatically sound and contextually meaningful.
Answer:Option 4, i.e. D-A, is the correct combination.