The correct answer is A.
If the President refuses to sign the bill or to veto it, the bill becomes law, without his signature. The only exception to this rule is the "pocket veto" which is a process by which the Congress suspends its sessions after to send a bill to the President and given his refusal to take any action, the Congress dismisses the bill.
He became a leader in the abolitionist movement which was made to end the practice of slavery
Generally speaking, a key development that occurred globally during the classical era was "<span>D. The expansion of cultural exchange through regional trade", since this was a time of cultural and technological diffusion. </span>