Which phrase signals a cause-and-effect relationship?
a) who use
b) to prevent
c) and thus
d) they were

The phrase "and thus" signals a cause-and-effect relationship.

Ex: I grew up with my dad never being home, and thus, have no fond memories of him.

not sure but i think it’s the snug nest

because most jews were in the concentration camps and dying horrible deaths while anne could be with her family in a warm place with shelter, food, water, and a place to sleep.