Ivan Valiela's Hypothesis That the Growth of Salt Marsh Grass

Ivan Valiela's hypothesis that the growth of salt marsh grass is limited by nitrogen availability was:

A) disproved by the growth of larger and taller grass in his control (nitrogen-fertilized) plots.
B) disproved by the growth of larger and taller grass in his experimental (nitrogen-fertilized) plots.
C) supported by the growth of larger and taller grass in his experimental (nitrogen-fertilized) plots.
D) supported by the growth of larger and taller grass in his control (nitrogen-fertilized) plots.
E) unsupported by a poor experimental design.