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In terms of brain size and intelligence among the options provided:
- Homo sapiens sapiens (modern humans) have the largest brain size and are considered the most intelligent among the choices given.
- Homo habilis and Homo erectus had smaller brain sizes compared to modern humans.
- Australopithecus afarensis, an earlier ancestor, had even smaller brain size and is not known for its high intelligence compared to Homo sapiens sapiens.
Therefore, Homo sapiens sapiens (modern humans) from the given options have the largest brain size and are considered to be the most intelligent.