Which method can be tested in a laboratory setting?

In the years since the OPEC oil embargo of 1974, increased public attention has been focused on ways to solve the "energy crisis" in the United States. This public awareness has resulted in practical suggestions for consumers, changes in government policy, research aimed at creating scientific advances in renewable energy resources, and more efficient use of existing energy resources.

Which method can be tested in a laboratory setting?
A . using less electricity in the home
B . developing an efficient solar energy collector
C . designing favorable tax systems to encourage use of wind power energy
D . encouraging voluntary energy conservation in the workplace
E . providing tax incentives for nuclear power plants

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Answer: B