The phrase "winnow out" in the second paragraph is closest in meaning to" __________."

A．Because it caused environmental pollution and didn't really benefit the budget.
B．Because the businessman turned mayor was persuaded by contractors to do so.
C．A new method was found to recycle the plastic in a cheaper way.
D．The new mayor of the city regards recycling as necessary.

A．He is on the side of the city government.
B．He is on the side of Miguel and residents.
C．He himself is confused with the problem.
D．He remains neutral in this affair.