What are some visual signs of root rot?

The presence of yellowing lower leaves and wilting margins serves as a clear visual sign of root rot. When a plant is affected by root rot, the roots become damaged and unable to properly absorb water and nutrients. This dysfunction typically causes the lower leaves to yellow as they are the first to be affected by the decline in nutrient uptake. Wilting margins occur due to a lack of water, which stems from the compromised root system, leading to insufficient moisture reaching the leaves. Hence, these symptoms are indicative of underlying issues with the roots.

In contrast, rapid leaf growth and bright coloration, strong root development and healthy stems, as well as bright green foliage with thick stems, are signs of a healthy plant. These conditions do not correlate with root rot and suggest that the plant is thriving rather than suffering from root-related diseases. Therefore, option B is the only choice that accurately reflects the symptoms associated with root rot.