Measurements were first based on parts of the A. pyramids. B. rectangle. C. car. D. human body.

The correct answer is: Option (D) Human body

Explanation:
Measurements were first based on the parts of human body. For example the old Eygptian "cubit" was the unit of length. It was measured by using the forearm.

1 cubit = The length from the elbow of the forearm to the tip of the middle finger.

In a nutshell, it is the human body that was used as the reference to measure things up.