Which of the following is true concerning kinetic-molecular theory and heat transfer between relatively hotter object a and relatively colder object b? a. molecules of object a collide with those of object b, and the molecules in object b move faster. b. molecules of object a collide with those of object b, and the molecules in object b move at the same speed. c. molecules of object b collide with those of object a, and the molecules in object a move faster. d. molecules of object b collide with those of object a, and the molecules in object b move slower.