You are given a short paragraph, a question and two choices to answer from. Choose the correct answer based on the paragraph and write the answer(not the key).

Paragraph: If there are more greenhouse gases in the atmosphere, more ultraviolet radiation will be trapped and the Earth will heat up.
 Question: Carl is studying climate change, and notes that less ultraviolet radiation is being trapped, which means the earth will be 
 Choices: A)cooler 
B)warmer
cooler