The answer is B: grow.
Explanation for each option:
A. Die - This is incorrect. Biotic potential refers to the maximum reproductive capacity of an organism under optimal environmental conditions. It does not cause populations to die; rather, it is a measure of the potential for growth.
B. Grow - This is correct. Biotic potential is the ability of a population to increase in numbers under ideal environmental conditions. It represents the maximum growth rate of a population.
C. Decline - This is incorrect. A decline in population is typically due to factors such as limited resources, predation, disease, or other environmental pressures, not biotic potential.
D. Remain stable - This is incorrect. Stability in a population is usually achieved when the birth rate equals the death rate, and it is not directly related to biotic potential, which is about the potential for growth.
In summary, biotic potential causes populations to grow under ideal conditions.