Final answer:
The normative statement is "People ought to exercise regularly for good health." It is an opinion, while the others are factual. The true statement from the additional information given is that the Earth and a human body exert equal and opposite gravitational forces on each other, as per Newton's third law.
Step-by-step explanation:
The normative statement among the options provided is B) "People ought to exercise regularly for good health." Normative statements are value judgments or subjective statements that carry an opinion, recommendation, or speculation, rather than purely factual information. Options A, C, and D are statements of fact or positive statements, describing things as they are.
Regarding the additional information provided, statement A from the seventh question is true: Earth exerts a force due to gravity on your body, and your body exerts a smaller force on the Earth, because your mass is smaller than the mass of the Earth. This is in accordance with Newton's third law of motion, which states that for every action, there is an equal and opposite reaction, although the forces are equal in magnitude, the effect is not noticeable on Earth due to its considerably larger mass.