Which of the Following Best Explains the Global Distribution of Plant

Which of the following best explains the global distribution of plant species, such as the Glossopteris, during the Mesozoic?

A) Seeds were small, so they could be carried by the wind.
B) Seeds were ingested by animals and later deposited in scat.
C) The landmasses were joined and the plant had a large geographic extent.
D) Oceans that transgressed on the continents carried the seeds to different locations.