Select the most appropriate set of words from the given choices to fill in the blanks.
The Himalayas ran from east to west and cut off the cold winds from the north. This allowed agriculture to proper and _____ wealth, but it also _____ barbarian invaders from the north.
The "but" indicates that the second part is a negative/undesirable effect.
Only option B conforms with the given situation.
Hence, the answer is option B.
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