Old World
How do New World monkeys differ from Old World monkeys?
New World monkeys are more dexterous than Old World monkeys.
New World monkeys have a prehensile tail.
New World monkeys are classified as anthropoids and Old World monkeys are classified as prosimians.
New World monkeys have nails; Old World monkeys have claws.
There are no arboreal Old World monkeys.
Ack ... I didn't realize this was a multiple-choice question. (I thought you were asking for more differences.) Please be more clear next time.
Of the answers you listed, the second one is the correct one. New World monkeys have a prehensile tail ... Old World monkeys do not.
----- {keeping my old answer below ... for the sake of honesty } ----
New world monkeys have two-color vision, like most mammals (what we generally call "color blind").
Old world monkeys and all apes (there are no New World apes) have three-color vision. Humans included.
There are exceptions ... but they prove the rule! The Howler monkey is a New World primate with three-color vision. But it uses a *different* third pigment from the third pigment shared by all Old World primates.
This shows an evolutionary/genetic link in the specific protein ... the third pigment ... found in all Old World primates.
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