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Which of the following statements is TRUE about changes to the amount of water vapor in air at a particular place over time?

  1. The amount of water vapor in air can increase, but it cannot decrease.
  2. The amount of water vapor in air can decrease, but it cannot increase.
  3. The amount of water vapor in air can increase, and it can decrease.
  4. The amount of water vapor in air cannot change.
Distribution of responses
Answer Choice
Overall
Grades
Gender
Primary Language
 
n = 2285
6–8
n = 1410
9–12
n = 873
Male
n = 1083
Female
n = 1169
English
n = 2038
Other
n = 189
A. 18% 19% 18% 18% 18% 18% 20%
B. 17% 17% 16% 16% 18% 17% 16%
C. 50% 50% 50% 52% 50% 50% 52%
D. 14% 14% 15% 15% 14% 15% 12%