How did the achievements and knowledge of islamic civilization reach european society?
a
muslim missionaries brought it with them along the silk road.
b
muslim armies conquered all of europe during the middle ages.
c
crusaders conquered the holy land and west africa.
d
crusaders and merchants brought it back home with them.

In a study, people were asked to imagine simple occasions that made them happy and to remember events that made them feel proud about themselves. it was observed that the subjects developed an increasingly positive attitude. these changes are known to be healthy, leading to greater physical activity and reducing unhealthy habits. based on this excerpt, we can conclude that a positive attitude .