Answer:
The answer is c) Poor farming techniques that killed the soil were combined with drought
Step-by-step explanation:
This phenomenon appeared in the year of 1930, the plains of the interior of the United States were hit by dust storms that transformed agricultural lands into practically sand deserts. Although it is thought that this was caused by a natural disaster, due to drought and high winds, the reality was very different and that tragedy was caused by man. This phenomenon was presented by drought conditions added to the years of poor soil management practices, which left it at the mercy of the wind.