I would say that the answer would be that it is a written agreement composed by a consensus of the new Settlers arriving at New Plymouth in November of 1620. The compact held the first written laws for the new land, and determined authority within the settlement.
The last choice there! It's a group of words that have a subject & verb, but it doesn't express a complete thought, so it's a dependent clause!! It begins with the subordinating conjunction, <em>because</em>.