Answer:
C. By explaining what techniques are used to seal the house.
Step-by-step explanation:
The passage that the question talks about is the first passage of the "Letters From The Dust Bowl" by Caroline A. Henderson to a friend named Evelyn. In the letter, she describes how the windy and dry condition of the place depicts the devastating nature of agricultural farmers during the great dust storms.
In the letter, Caroline mentioned that since it was to dusty, they had to cover their heads and faces, and even applying vaseline to their noses. The visibility of the place was almost nil, "everything covered again with a silt-like deposit which may vary in depth from a film to actual ripples on the kitchen floor". She then continue to detail how people would prevent the dusts from entering, some using "gummed-paper strips" while she herself used "oiled clothes" to cover the cracks or any opening. This detailed description of how they tried to prevent the dust from coming in demonstrates how "It is an almost hopeless task" to keep dust out of the house.