Question

What did Hernando de Soto discover in 1541?
A. the St. Lawrence River
B. the Mississippi River
C. the Appalachian Mountains
D. the Rocky Mountains

Answer 1

On May 8, 1541, south of present-day Memphis, Tennessee, Spanish conquistador Hernando de Soto reaches the Mississippi River, one of the first European explorers to ever do so.

so the answer is the Mississippi river