Please answer the following question: You are presented with the question "What has a negative impact on the population size of a species?" and the following answer choices: - Pesticides - influenza - steroids - liver cancer - cloudy and rainy weather - massive damage - cosmetic testing - killing insects Now knowing that harming an animal species has a negative impact on the population size of that species and animals are harmed because of cosmetic testing, choose the best answer.
A:
cosmetic testing