What is the main idea of the text? it takes caution to create a perfect business situation, and rockefeller was always cautious. rockefeller was a patient man who thought out and prepared for his business activities. rockefeller’s instinct for making money was the greatest contributor to his success.

B:  Rockefeller was a patient man who thought out and prepared for his business activities.

i believe the correct answer is option b. most eastern european nations joined nato.

though i could be wrong, option d. the eastern european nations were granted complete independence, would be another choice.

hope this ! : )

offline recommendation systems option b

because recommendation systems produce a list of two ways

1. through collaborative filtering

or

2. through content-based filtering