C because the other options have title of things that should of been capatilized
To isolate yourself or to close yourself off to something.
Part A:
A - Wind power is an underused resource that has the potential to provide the energy to power electricity for the entire country.
Part B:
Effective; the author acknowledges the counterclaim and explains the U.S. Department of Energy’s plan to increase the use of wind energy in the future.
A tone is a musical or vocal sound with reference to its pitch, quality, and strength. Some words to describe it are <span><span>mood, air, spirit, feel, sound, flavor, note, attitude, character, nature, manner, <span>temper.</span></span></span>