Several Species of Mice Occupy the Same Meadow

Several species of mice occupy the same meadow. One species remains near the stream; one is found almost exclusively among the dense undergrowth; and a third species is mainly seen in the open parts of the meadow. Since these three species of mice can coexist, they are probably demonstrating

A) competitive exclusion.
B) competitive inclusion.
C) symbiosis.
D) resource partitioning.
E) habitat division.