About ____ of the meteorologists and atmospheric scientists in the United States work in the field of weather forecasting.

The correct answer is: A. One-tenth

According to the American Meteorological Society, about 10% of meteorologists and atmospheric scientists in the United States work in the field of weather forecasting. The other 90% work in a variety of other fields, such as research, education, and government.

Option B, one-half, is incorrect because it is too high. Option C, three-quarters, is incorrect because it is too high. Option D, nine-tenths, is incorrect because it is too high.