Which of the Following Finally Ended the Struggle of the Orders

Which of the following finally ended the struggle of the orders, a political power struggle between Rome's most aristocratic families (the patricians) and the rest of Rome's citizens (the plebeians) ?

A) The plebeians learned to manipulate the patronage system and influence patrons to legislate in favor of plebeian interests.
B) In 451 B.C.E., the ban on marriage between plebeians and patricians was lifted.
C) The patricians agreed to make plebeians eligible for membership in the Roman Senate.
D) In 287 B.C.E., the plebeians won the right to draft and pass laws in their own assembly.