The correct statement that describes most cinder cone volcanoes is:
They have a single, symmetrical cone at the top.
Cinder cone volcanoes are typically characterized by their steep, conical shape and have a single vent from which they erupt. They are generally shorter than other types of volcanoes, such as stratovolcanoes or shield volcanoes. Additionally, they tend to accumulate rapidly, often formed in a relatively short time compared to other volcano types.