Question

What is the central idea of this selection?
A Human perception of time has long remained unchanged.
B Light travels faster than sound.
C Mechanical clocks are the most accurate measures of time.
D Scientists have developed many ways to measure time.

Answer 1

The central idea of the selection is: **D Scientists have developed many ways to measure time.** This option encompasses the broader concept of time measurement advancements rather than focusing on a single aspect like human perception, the speed of light, or the accuracy of mechanical clocks.