Linguist: Three of the four subfamilies of the so-called "Austronesian" languages are found only among indigenous peoples in Taiwan, whereas the fourth is found on islands over a huge area stretching from Madagascar to the eastern Pacific Ocean. Since these subfamilies all originated in the same language, which must have been originally spoken in a single geographic location, these facts suggest that Taiwan is the homeland where Austronesian languages have been spoken longest and, hence, that Austronesian-speaking peoples originated in Taiwan and later migrated to other islands. Which one of the following most accurately expresses the overall conclusion drawn in the linguist's argument? ['The Austronesian family of languages has four subfamilies, three of which are found only among indigenous peoples in Taiwan.', 'Austronesian-speaking peoples probably originated in Taiwan and later migrated to other islands.', 'Austronesian-speaking peoples originated in the homeland where Austronesian languages have been spoken longest.', 'Taiwan is probably the homeland where Austronesian languages have been spoken longest.']