Despite extensive archival investigations, historians still find the motives behind the treaty's sudden cancellation quite ----.
Answer and explanation
Correct answer: C. enigmatic
- Step 1: The clause 'Despite extensive archival investigations' signals contrast; the true motives remain mysterious or hard to explain.
- Step 2: 'Enigmatic' means difficult to interpret or mysterious.
Answer
enigmatic.
Why not the others: 'Transparent' means easily understood or seen through; 'Tangible' means perceptible by touch or clear; 'Negligible' means insignificant.
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