Two Species of Buttercup Are Found in the Same Field

Multiple Choice

Two species of buttercup are found in the same field in South Dakota, but they emerge at different times: One species emerges and flowers in early spring, and the other species does not emerge until late summer, after the first species has set seed. This is probably an example of:

A) habitat fragmentation.
B) niche fragmentation.
C) niche realignment.
D) resource partitioning.
E) intraspecific competition.