Many inventions have had several people working on the idea and the idea was developed over years.Which of the following inventions does NOT fit this example?
A)concrete
B)optical lenses
C)gun powder
D)network marketing

Question

Quizplus · Accepted Answer

Network marketing is a relatively recent concept that was not developed over years by multiple people. It was pioneered by companies such as Amway in the 1950s and has since evolved, but the basic concept remains the same. Concrete, optical lenses, and gunpowder have all been developed over time with contributions from multiple individuals.

Many Inventions Have Had Several People Working on the Idea