3. one improper construction method that can result in structural weakness is a. retention of topsoil and trees on the home site. b. construction of artificial terraces using debris and backfill. c. grading soil to direct runoff away from the structure. d. the use of kiln-dried lumber in structural components.

1.        

One improper construction method that can result in structural weakness is retention of topsoil and trees on the home site. The answer is letter A. The trees provides moisture in the topsoil and can be easily uprooted when storm comes. This can greatly affect the construction of a building.

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explanation:

d. new methods of assembly are introduced.

explanation:

this allows for the goods to be made on a larger scale. not faster because now it is shown to be made better, hence the greater productivity in the question. it is calling for something new to be introduced.