❀ a. The industrial revolution started from the European countries.
b. The rivers of Europe are navigable.

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The correct answer is B

Explanation:

Thanks for the points

1.The industrial revolution in Europe didn't happen overnight but only spread over the continent very gradually. One of the triggers was the unusually high growth in the population which set in around the middle of the 18th century and produced a gigantic reservoir of workers.

2.Rivers are the lifeblood of Europe. They provide us with water, food, transport, and power, supporting the economies of rural communities and major cities across the continent. They also provide us with many of our fondest memories as well as wonderful spots to fish, birdwatch, swim and sunbathe.