词汇精练——key

In the late sixteenth century and into the seventeenth, Europe continued the growth that had lifted it out of the relatively less prosperous medieval period (from the mid 400s to the late 1400s). Among the key factors behind this growth were increased agricultural productivity and an expansion of trade.
The word "key" in the passage is closest in meaning to
○ historical
○ many
○ important
○ hidden

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