It would be the "the preamble" that implies a plan of action and lists certain things to be changed, since the introduction is far more general in exclaiming why in fact they are claiming independence.
Because it was done that way to spread fear and send a message.
It wasn't simply murder, it was a statement.
Among the choices posted, the best and only sensible answer is: the search for food items. The Asians who crossed the Bering Strait did not need to spread religion, to bring slaves from Africa nor the desire to conquer new peoples.
D) it extended support to elderly citizens