The passage suggests that which one of the following was true of southern planters in the United States? A. They were as prepared for collective protest as were their Russian counterparts. B. Few of them owned plantations on which fewer than a hundred slaves worked. C. They managed their estates more efficiently than did their Russian counterparts. D. Few of them relied on intermediaries to manage their estates. E. The size of their estates was larger on average than the size of Russian estates.