Answer:
C. Context clues
Explanation:
Context clues are <em>hints found within </em>a sentence, paragraph, or passage that a reader can use to understand the meanings of new or unfamiliar words. Context clues can also take the form of synonyms, antonyms, word-structure clues, comparisons (such as metaphors and similes), and contrasts.
I believe that the answer is A
Because they do not realize how valuable it is.
CENTCOM is trying to figure out what happened to the 507th