Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential information. A. The similarities in fauna and flora across Southern Hemisphere continents were explained in the late nineteenth century. B. In the nineteenth century it was discovered that the Southern Hemisphere continents contain fauna and flora that are highly similar. C. In the nineteenth century, it was suggested that the modern continents of the Southern Hemisphere were once connected. D. The fauna and flora of the modern continents of the Southern Hemisphere were found to be very similar in the late nineteenth century.