C. <span>Members are self selected.</span>
<h2> B.Rome was built on seven hills, which offered natural protection from invaders.</h2>
The correct option is B.
The constitution gives the congress men the right to talk freely during congress debate without any fear of being sued for what had been said. Congress men can not be sued or prosecuted for anything that they say during debate in the floor of the house.
A push factor is something that pushes someone away from their home country, such as a war in their home country,, a pull factor is something that pulls someone to a new country, such as the promise of new lands/ new opportunity or gold