Critical Reasoning (CR) | Re: Pundit: By passing the recent tax bill, the Republicans have likely

PREMISE:
In polling since the passage of a recent tax bill, Republicans have trailed their competitors by 8 to 10 percentage points.
CONCLUSION:
By passing the recent tax bill, Republicans have thrown away their majority in the upcoming election.

The argument uses the POLLING to support theconclusion.
It ASSUMES -- without any evidence -- that the Republicans' negative poll numbers are DUE TO the passage of the tax bill.
B, negated:
The poll numbers prior to the tax bill’s passing were essentially
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