Final answer:
The correct answer is B, which states that gravity would pull both the notebook and the pencil to the ground. Their acceleration would be the same due to gravity being a consistent force on all objects, regardless of their mass, as long as there is no air resistance.
Step-by-step explanation:
If a notebook and a pencil were to fall off a table, B. Gravity would pull them to the ground. According to the principles of physics, as set forth by Galileo and later expanded upon by Einstein, all objects in a vacuum, regardless of their mass, will experience the same acceleration due to gravity. This means that, absent any air resistance, the notebook and the pencil would hit the ground at the same time. The correct answer does not suggest that the mass of the objects would be similar (A), nor that their acceleration would be different (C), and the idea that gravity would make the notebook fall sooner because it is heavier (D) is a common misconception.
Galileo's experiments demonstrated that objects, irrespective of their mass, will fall at the same rate in the absence of air resistance. This was illustrated thoughtfully with the concept of a large room falling around people at the same rate they are falling, as seen in the reference material. Einstein's postulate on the equivalence of gravity and acceleration further supports this, asserting that gravity and acceleration are indistinguishable in free fall.