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A
Easy to understand
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B
Covering everything; including all or much of the material
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C
Short
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D
Difficult
Why this is the answer
Context clues: 'covering material from the entire semester' is essentially a definition of comprehensive. The word 'comprehensive' means complete, thorough, covering all aspects. Distractor analysis: 'easy to understand' — comprehension is a different word meaning understanding; comprehensive means covering everything; 'short' — the opposite; 'difficult' — comprehensive doesn't necessarily mean difficult, though comprehensive tests often are. Note the word family confusion: comprehensive (covering everything), comprehensible (understandable), comprehension (understanding). On ASVAB, words may be used in unfamiliar ways; rely on context, not just prior knowledge of the word. If two answer choices both seem possible, the one with stronger context support wins. If you don't know the word at all, use process of elimination plus context clues to make the best guess.
Source: ASVAB PC — Context Definitions