The Dominant Saltmeadow Cordgrass (Spartina Patens) Was Planted Across an Elevation

The dominant saltmeadow cordgrass (Spartina patens) was planted across an elevation gradient around a stress-tolerant low marsh species, smooth cordgrass (S. alterniflora) . Within six months, S. alterniflora had suppressed the stature and growth of S. patens. This is an example of

A) competitive reversal.
B) competitive exclusion.
C) niche partitioning.
D) fugitive species interactions.