Which of the following statements is true? A. Only objects that are very close together exert gravitational forces on each other. B. Only objects that are as large as planets exert gravitational force

Which of the following statements is true? A. Only objects that are very close together exert gravitational forces on each other. B. Only objects that are as large as planets exert gravitational forces on other objects. C. Objects can only exert gravitational forces if they are at least as dense as water. D. Any object with mass exerts a gravitational force on all other objects.