A physical object which would experience the greatest gravitational acceleration is: A. a cubic meter of lead.
A gravitational force is also referred to as gravity and it can be defined as a universal force of attraction which acts between two (2) physical objects, especially by pulling them together.
A gravitational acceleration can be defined as the rate of change of the velocity of an object in free fall with respect to time, especially due to effect of a gravitational force. Also, gravitational acceleration is usually measured in meter per seconds square (m/s²).
Generally speaking, gravitational acceleration is highly dependent on the weight of a physical object. This ultimately implies that, the greater the weight of a physical object, the higher would be the gravitational acceleration it experiences.
In this context, we can reasonably infer and logically deduce that a physical object which would experience the greatest gravitational acceleration is a cubic meter of lead because it has the least weight in comparison to the other objects.
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