When a population nears its carrying capacity, the most accurate statement from your choices is resources naturally decrease. As the population increases and approaches the carrying capacity of the environment, the demand for resources (such as food, water, and shelter) can lead to depletion of these resources. This can result in increased competition among individuals for the limited resources available, which can negatively impact the overall health and survival of the population.
The other options, such as competition being no longer a factor, exponential growth occurring, and resources increasing, do not correctly describe the dynamics of a population nearing its carrying capacity.