Yes, we need “o” for the sentence to sound good. Because if you’ll ask the question differently you still need “o” - Pe care dintre ele o alegi? - the word “o” helps you choosing which one do you want - bogăție sau sărăcie = wealth or poverty. Is like asking from those two things which one do you choose and in romanian you need to put the “o” for the sentence to be complete. “O” is used in this sentence because the words are feminine, if they were masculine you would have used “îi” for plural and “îl” for singular. The plural for “o” is “le”
If one is singular and the other plural we use the singular. Example: 3 pisici și un iepure, pe care îl alegi? ~ 3 cats and a rabbit, which one do you choose? The nouns are even feminine and masculine in this sentence - cat - fem, rabbit - masculine . If one is masculine and one feminine you use the form that is the last, if is masculine you use masculine, if is feminine you use feminine, like i did in the example.
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