The island is so small that there are only five houses . . . . . . . . it. A. on B. in C. over D. out

on
in
over
out

The correct answer is on.

The other options are incorrect because:

  • In is not correct because it suggests that the houses are inside the island, which is not possible.
  • Over is not correct because it suggests that the houses are flying over the island, which is also not possible.
  • Out is not correct because it suggests that the houses are located outside of the island, which is not the case.

The island is so small that there are only five houses on it. This means that the houses are located on the surface of the island, and they are not inside or outside of it.