The answer is A, high blood pressure. This is because when a person starts to participate in a activity that they didn't warm up or prepare to do, the person's blood pressure increases as a result of suddenly doing hard work, so the heart starts to quickly pump blood to the body, resulting in the high blood pressure.
The answer is option A "high blood pressure." When a person is about the start a physical activity the he isn't prepared for he would most likely increase in heart rate, and when the blood pumps fast enough and pushes blood against the person artery walls it could cause high blood pressure. Also, before a person starts a physical activity it's good for the person to stretch to avoid pulling any muscles. High blood pressure can cause headaches, migraines, and sometimes nose bleeds.
