You may want to stress on the "diversity, with examples" that you will be bringing to the University. There is no right or wring answer for this kind of question; however, they want to see your thinking process.
i will bring pride to the school. bring pride to the school from my attendence. the best student goes to the best university. during my years in college, i would actively participate in different activities that help give back to the school and society. i believed that the school will make the best out of me and i would make the best out of myself to give back.
applying to UCs? who knows how to answer that question perfectly. i guess you just bull shit on that one. they want to know what benefits they can get from you.