Final answer:
Stratus clouds have bases below 6,500' and typically bring light, steady precipitation.
Step-by-step explanation:
The cloud with bases below 6,500' would be c) Stratus.
Cirrus clouds are high-level clouds that form above 18,000'. Cumulonimbus clouds are tall, towering clouds that are associated with thunderstorms. Altostratus clouds have bases between 6,500' and 20,000'.
Stratus clouds, on the other hand, have a low, uniform, and featureless appearance. They typically form at low altitudes and have bases that are below 6,500'. These clouds often cover the sky and can bring light, steady precipitation.