PLEASE HURRY please pick one answer from below

What invention increased trade to the East and allowed for safe travel over long distances?
0 Grand Canal
0 Silk Road
0 woodblock printing
0 magnetic compass

The process of learning acceptable social behavior and values is called

Where did the constitutional convention take place

Martha participates in a research study in order to receive extra credit for her psychology class. when she arrives in the research office she is given a can of what looks and tastes like beer, but which actually contains no alcohol. in the adjoining room martha's classmate karen is also participating in the study. karen receives a can of alcoholic beer. if the experiment was designed to test the effects of alcohol on concentration, then who is exposed to the independent variable?