Answer:
Correct answer is plebeians.
Step-by-step explanation:
Correct answer is plebeians because all of them contributed to the welfare of plebeians. Brothers Gracchus introduced agrarian reform, that allowed division of land on a more fair scale. On the other hand Caesar distributed to land to the common people, and many believed that he was even born as plebeians.
All other options are false, because their reforms weren't focused on the improving the status of consuls, patricians and Senate.