Some Tibetan nomads used yak butter as a commodity (Option B), one that often took the place of money in commercial transactions.
Sentence completions test the skill to use the information observed in complex and incomplete sentences in order to correctly complete them.
It tests a candidate's vocabulary power and skill to follow the logic of sentences.
Now,
Hence, by sentence completion, some Tibetan nomads used yak butter as a commodity (Option B), one that often took the place of money in commercial transactions.
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