How did early government support economic growth in river valley civilizations

Civilizations developed around rivers because their waters provided places to hunt and fish. Also, as the rivers flooded, the lands around them became fertile. This allowed them to support farming. This is especially true of the Nile River, which flooded the same time each year.

Explanation:

offline recommendation systems option b

because recommendation systems produce a list of two ways

1. through collaborative filtering

or

2. through content-based filtering