Two thirds of Europe's Jewish population is killed cause or effect

When Hitler came into power he promised that he would rebuild the German army.  Later on Hitler started accusing the Jews of making them lose WW1.  So in 1939 the German army invaded Poland.  That was the start of a Blitzkrieg strategy which means lightning war.  In 1940 Germany invaded Czechoslovakia, Denmark,  Norway, Belgium, Netherlands and Luxemburg.  In 1941 Germany invaded France and Greece.  Nearly 11 million Jews were slaughtered.

offline recommendation systems option b

because recommendation systems produce a list of two ways

1. through collaborative filtering

or

2. through content-based filtering

social contract theory, nearly as old as philosophy itself, is the view that persons' moral and/or political obligations are dependent upon a contract or agreement among them to form the society in which they live