Every winter morning when the sun is shining bright, a man living in Montana pulls back the drapes on a large, south-facing window. In this way, he helps heat his home using .

passive solar heating

Explanation:

Based on the information provided within the question it can be said that in this way, he helps heat his home using passive solar heating. This is when a building's architecture is completely designed to collect, store, reflect, and distribute the incoming solar energy as heat in the winter as well as repel the solar heat in the summer.

even though you have attached neither the chart nor the generalizations, i have located them online. the right answer is d, since they are asking you about a generalization. you can only infer from the chart that between 2008 and 2009 the number of employed workers decreased significantly (from over 115 millions to 107 millions approximately), which signals some type of economic crisis.  

answer; obscene;