Which of the following was a challenge faced by the earliest overland explorers?

a. uneasy relationships with native american
b. an undependable food supply
c. the lack of maps to chart their passage
d. all of the above

Why is the federal reserve managed under the oversight of the federal government? the fed is responsible for printing and coining money. the fed is responsible for collecting income taxes. the fed is responsible for the government’s money. the fed is responsible for paying off government debt.(the first option isn't correct i tried that one)edit: the answer is the fed is responsible for the government’s money.