Which of the following is a valid explanation as to why children are at a higher risk to health effects relating to environmental hazards? a. Children's smaller lungs make them more likely to fill up with harmful chemicals. b. Children's immune systems are not fully developed causing them to be at a higher risk. C. Children have less outdoor exposure, making them less adapted to outside conditions. d. Children take more shallow breaths than adults, causing them to inhale contaminants more frequently . Please select the best answer from the choices provided A В D C