Until recently, anthropologists generally agreed that higher primates originated about 30 million years ago in the Al Fayyum region of Egypt. However, a 40-million-year-old fossilized fragment of a lower jawbone discovered in Burma (now called Myanmar) in 1978 was used to support the theory that the earliest higher primates originated in Burma. However, the claim is premature, for __. Which one of the following, if true, is the most logical completion of the paragraph above? ['there are no more primate species in Burma than there are in Egypt', 'higher primates cannot be identified solely by their lower jawbones', 'several anthropologists, using different dating methods, independently confirmed the estimated age of the jawbone fragment', 'other archaeological expeditions in Burma have unearthed higher-primate fossilized bone fragments that are clearly older than 40 million years']