The Grange was the first major farmers' movement to emerge after the Civil War.
Option - B
Step-by-step explanation:
After the civil war, the Grange, an Agrarian movement which is officially called The National Grange of the Order of Patrons of Husbandry was founded in 1867.
It is initiated to develop the agricultural methods and to advance the socio-economic needs of US farmers. Advent of railroads was blamed for the major problems faced by the farmers, due to its overcharging and the grain storage facilities.
Other options:
A. In 1875, the Farmers Alliance was formed to protect the interest of the farmers.
C. In 1891, the populist party was formed to upgrade the conditions of the agrarians.
D. In 1833, the Whig Party opposed the Democratic Party (President Andrew Jackson and policies developed by him)