Complete the sentence with the appropriate modal verb: Based on the laboratory test results, the chemical compound ______ be hazardous, as all toxicity markers are completely negative.
Answer and explanation
Correct answer: B. cannot
- Step 1: Analyze logical deduction: The evidence states that 'all toxicity markers are completely negative'.
- Step 2: Determine degree of certainty: A negative certainty or logical impossibility in the present requires 'cannot' (can't).
- Step 3: Confirm syntax and meaning: 'cannot be hazardous' signifies that it is logically impossible for the compound to be dangerous.
Answer
cannot.
Why not the others: 'must' expresses positive certainty contradictory to negative markers; 'might' expresses possibility rather than conclusive impossibility; 'should' expresses expectation or advisability.
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