Which Statement Best Describes the Dispute About Global Warming

Which statement best describes the dispute about global warming?

A) Few people deny that Earth's temperature is rising. The question is whether the temperature increase is due to the greenhouse effect or solar activity.
B) Few people deny that Earth's temperature is rising. The question is whether the temperature increase is due to natural or human-related causes.
C) People disagree about whether or not the Earth's temperature is changing. Some say Earth's temperature is rising. Others say it is falling.
D) People disagree about whether or not the Earth's climates are changing. Some say climates are stable, and others say that climates are becoming milder.