What was martin luther's main objection with the catholic church?

~Martin Luther's Main Objective With The Catholic Church Was That Salvation Is Reached Through Faith And Not Deeds, Shaped The Core Of Protestantism.

Hope this helps.

to act quickly in times of danger to the united states

because you have to act quickly if you want to live/survive.

offline recommendation systems option b

because recommendation systems produce a list of two ways

1. through collaborative filtering

or

2. through content-based filtering