Answer:
Because it inhibits or hinders the growth and widespread of a population
Step-by-step explanation:
In biology, a limiting factor is any factor e.g. biotic or abiotic, whose actions hinders or truncates the growth of a population of organisms. Limiting factors can either be density dependent or density independent.
Density dependent limiting factors are those factors that depend on the population size e.g. disease, predation etc. Density independent factors are those that do not depend on size of a population to hinder its growth e.g. natural disasters such as drought, hurricanes, flooding etc.
According to this question, DROUGHT is a limiting factor, specifically a density independent factor because it has the ability to hinder the growth of a population.