Trivia: Which of these measurement units was used first?
Correct Answer: Cubit
So why is this answer correct? : The cubit, a length traced back to Ancient Egypt, is one of the earliest known measurement units. While cubits were generally measured as the length of the forearm (from the tip of the middle finger to the elbow), Ancient Egyptians also developed a royal standard, a black granite rod that measured around 52.2 cm in length. Cubits were used to measure in architecture and other building projects, and were taken extremely seriously; all other cubit rods needed to be measured to the royal standard for standardization, and failure to do so could be punishable by death.