Who presided over the Congress?

The President of the Continental Congress, later known as the President of the Congress of Confederation, was the presiding officer of the Continental Congress, the convention of delegates that emerged as the first (transitional) national government of the United States during the American Revolution. The president was a member of Congress elected by the other delegates to serve as a neutral discussion moderator during meetings of Congress. Designed to be a largely ceremonial position without much influence, the office was unrelated to the later office of President of the United States.[1] Upon the ratification of the Articles of Confederation (the new nation's first constitution) in March 1781, the Continental Congress became the Congress of the Confederation. The membership of the Second Continental Congress carried over without interruption to the First Congress of the Confederation, as did the office of president.

Explanation:

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

where are the options?

explanation: