20. Although very little is known of Taiwan's early history, carbon dating of domestic implements found in the south of the island suggests that people have lived there for at least ten thousand years. (A) There is evidence to suggest that Taiwan has been populated for over ten thousand years. (B) The small amount of evidence available suggests that people came to northern Taiwan only recently. (C) Carbon dating techniques have produced a wealth of information about Taiwan's early settlers. (D) Ten thousand years ago, Taiwan was an important trading center with an expanding population.