Which of the following about the expansion of islam is not true?

missionaries joined trade caravans in order to spread islam.
muhammad united the many tribes of arabia after he conquered mecca.
expansion was a slow process because it was met with strong opposition from the islamic world.
the nations of europe were threatened by muslim expansion and sought to stop it.

the industrial revolution pushed the world into modern industrialization. it changed the course of history profoundly. it caused rapid urbanization and pushed cities and countries into development. the industrial revolution began in great britain with a series with new inventions which led to the creation of machines and mass production.

this caused the country to gain wealth and money and become an international superpower. it improved transportation and manufacturing inside the country, pushed people to live in urban areas and britain to become the most powerful nation in the world for a while.