The land was divided . . . . . . . . the two sisters.

In this sentence, the land is being divided among the two sisters, which means it is being shared between them.
The correct preposition to use in this context is "between."
So, the correct sentence is: "The land was divided between the two sisters."
Option C, "between," accurately conveys the idea of sharing or dividing something among multiple people or entities.
Therefore, the correct answer is Option C: between.