Even though the europeans were exploring other lands, what was one reason they did not explore all lands?

They were not able or even they were scared to explore all lands

Explanation:

Why they were scared was that they thought that they would get attacked by the Native Americans. And they thought the lands ended because of all the rocky Montanans... and you get what they are named.

what are the options so i can answer it

offline recommendation systems option b

because recommendation systems produce a list of two ways

1. through collaborative filtering

or

2. through content-based filtering