Answer: A
Step-by-step explanation:
Option A, "Eating less meat is an important way to fight climate change," would best back up the claim that "We should all try to eat one more meatless meal a week" based on the finding in the source that reducing the amount of beef people eat is necessary to prevent the worst effects of climate change. Eating less meat, including beef, is one way to reduce the amount of greenhouse gases that are produced by the meat industry and contribute to climate change.