The correct answer is d. Galileo Galilei.
Galileo Galilei, an Italian scientist and mathematician, demonstrated that objects of different masses would reach the ground together when dropped from the same height. This crucial insight into the nature of free-falling bodies is attributed to his famous experiment conducted at the Leaning Tower of Pisa. According to the legend, around the late 16th or early 17th century, Galileo dropped objects of different masses from the Tower to show that, in the absence of significant air resistance, they all fell at the same rate. This experiment challenged the prevailing Aristotelian notion that heavier objects fell faster. Galileo's work laid the foundation for our modern understanding of the laws of motion and gravity, eventually influencing Isaac Newton's formulation of the laws of motion.
The probable question may be:
Who demonstrated that objects of different masses would reach the ground together when dropped from the same height?
a. Isaac Newton
b. Archimedes
c. Robert Boyle
d. Galileo Galilei