Question

From 1934 to 1940, severe drought ravaged an area of the United States covering parts of Kansas, Oklahoma, Texas, New Mexico, and Colorado causing what is knows as the dust bowl. Winds reaching 60 miles per hour whipped the dirt into gigantic clouds as high as 1,000 feet blocking the sun. Dust storms blanketed roadways in clouds of swirling dust stranding motorists. Dust reached the White House and ships out at sea. Because the soil was blown away, farmers left the affected areas. By the end of the decade an estimated 300,000 people from Oklahoma migrated to California in hopes of finding work and a better life. John Steinbeek immortalized the hardships and misery of these Okies in his 1939 novel The Grapes of Wrath.

The dust was bowl was caused by a combination of several things, drought and -
Responses
A over-grazing by livestock and poor farming techniques.over-grazing by livestock and poor farming techniques.
B the planting of farm crops in place of the native grasses.the planting of farm crops in place of the native grasses.
C high spring and summer temperatures and the decline of the bison.high spring and summer temperatures and the decline of the bison.
D the development of the railroad and highway system throughout the country.

Answer 1

A — over-grazing by livestock and poor farming techniques.