The sentence tests use of tense. The intended meaning is that after the referendum was passed the town started using casino tax for x purpose and this is still in force.
Therefore, A & E can be ruled out. In choices B "for the approving of" is unidiomatic.
Choice C can be eliminated for using "approved". Choice D is the final answer.
Therefore, A & E can be ruled out. In choices B "for the approving of" is unidiomatic.
Choice C can be eliminated for using "approved". Choice D is the final answer.



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