Algae development will cause which of the following?

The correct response regarding the effects of algae development is the rapid fall in pH, as certain types of algae can produce organic acids during their metabolic processes. When algae proliferate, they may contribute to lower pH levels in water bodies due to the production of these acids, which can alter the water chemistry and create an unfavorable environment for other aquatic life.

In addition to affecting pH, algae blooms can also consume significant amounts of dissolved oxygen in the water, which can lead to hypoxia and negatively impact fish and other organisms. While reduced water clarity, increased chlorine consumption, and slimy growth are indeed associated with algae presence, the specific outcome of a rapid fall in pH is particularly notable due to the metabolic byproducts associated with algal growth. This biochemical impact is crucial to understand in the context of managing water quality in both natural and recreational water bodies.