Which of the following is a sign of overwatering in plants?

Leaf yellowing is a classic sign of overwatering in plants. When plants receive too much water, the roots become waterlogged, which can lead to a lack of oxygen in the root zone. This situation can cause the roots to function poorly, ultimately affecting the plant's ability to take up nutrients. As a result, chlorophyll production diminishes, leading to yellowing leaves.

While signs like wilting leaves or stunted growth can be more common in plants suffering from underwatering or other stress factors, yellowing specifically highlights the nutrient uptake issues associated with overabundance of moisture. In contrast, rapid growth is typically associated with optimal watering and nutrient conditions, making it an unlikely indicator of overwatering.