Which legislative tool would a senator most likely use to prevent a bill she dislikes from becoming law if a majority of her colleagues support it

A Senator is able to use a filibuster in order to prevent a bill he /she dislikes from becoming law if a majority of his/her colleagues support it.

A filibuster in the United States Senate is a political strategy in which a senator speaks in order to prevent a measure from being brought to a vote. It is a dilatory tactic by which senators engage in extended debates as an attempt to delay or block a vote on a bill. The Senate rules allow a senator to make of a filibuster unless two-thirds of the Senators vote to invoke “cloture,” which is an official closure to debate.

the answer to your question is a. the salt plains

in 1811, he led an expedition, known as the george c. sibley expedition, to improve relations with the pawnee and kansa tribes, and also to locate the rumored jefferson's salt mountain