According to the passage, Eltis argues against which one of the following contentions? A. Popular support for antislavery measures existed in Britain in the early nineteenth century. B. In the early nineteenth century, colonies that employed forced labor were still economically viable. C. British views concerning personal liberty motivated nineteenth-century British opposition to slavery. D. Widespread literacy in Britain contributed to public opposition to slavery in the early nineteenth century. E. Antislavery measures proposed by conservative politicians in the early nineteenth century met with little opposition.