I think the answer is *productive.
December is to winter as September is to Fall (or Autumn).
The proposal that the committee should choose is proposal 2.
From the information given, it should be noted that Proposal 2 would generate more money for the library.
A great way to make money for the library would be holding a car wash. Since the softball team at the school raised over $400 at their car wash last year, this is an avenue to raise more money. This will be important in getting the needed funds and achieving the aim.
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The answer would be 3, a preposition or a conjunction. Hope this helped.