Which legislative tool would a senator most likely use to ensure a bill she supports become law even though the house and senate passed substantially different versions of the bill?

can you please give the answer choices

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the answer that best explains what happened to george washington at fort necessity, pennsylvania is : washington was attacked by the french but was able to negotiate with them to peacefully end fighting. the battle took place on july 3, 1754. the battle is considered as being the start of the french and indian war.