Respuesta :
Answer: D) a widespread drought through the ecosystem
Explanation:
A limiting factor is the one which can limit the growth, abundance and distribution of the population of a species in an ecosystem or any other region. A density independent limiting factor is the factor which limits the population of the species irrespective of it's density.
A drought is a natural calamity which can affect the population of the species naturally. This can limit the population irrespective of the density of the population.