Help me! 6th grade work due today

Latitude or distance from the equator – Temperatures drop the further an area is from the equator due to the curvature of the earth. In areas closer to the poles, sunlight has a larger area of atmosphere to pass through and the sun is at a lower angle in the sky.

Explanation:

the answer is:

carbon dioxide

i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.