Exercise aka physical health
I believe the answer is Sexual Orientation. That is what I would choose based on how the question is stated.
An 18 month old baby and experiencing the world through senses is in Piaget's sensorimotor stage. The sensorimotor stage is the development of our senses such as, sense of sight, hearing, feeling, tasting and smelling. The sensorimotor stage is developed through 18 to 24 months of age.
The correct answer is 8 people. It is considered that in the year 2011, approximately 8 people died every day due to motor vehicle accidents or collisions. These accidents may be caused by a series of factors, such as reckless driving, driving under the influence of liquor and also driving unsafely or using rough maneuvers.