Which statement is an example of an opinion?
A. The Treaty of Guadalupe Hidalgo established the Rio Grande as
the border between the United States and Mexico.
B. The Mexican-American War should be considered one of the
greatest victories of the United States.
C. The United States gained large amounts of land because of the
Mexican-American War.
D. The Treaty of Guadalupe Hidalgo, signed in 1848, officially ended
the Mexican-American War.