Environmental stress relates to physical, chemical, and biological limitations on the fertility of varieties and on the improvement of ecosystems. Stressors can be physical environmental factors, or they may arise from the activities of people. Daily life is full of environmental stressors that make minor annoyances. If you use an alarm clock to rise up, the loud noise from your signal is an environmental stressor. Extreme warmth is also environmental stressors and can start to trouble. Other natural environmental stressors involve noise.
The answer is C. cancer that may stress the victim of the disease by unlike the other options those around them other than family won't really be affected. Hope that helped, even if it makes humans as a whole seem really cruel.
1: loss of energy to do activities 2: get behind in school, failing classes 3: some jobs could be dangerous with drug use 4: family may become mad about drugs