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 are formed from the accumulation of volcanic debris, such as ash and cinders, ejected during eruptions. They are generally not the tallest type of volcanoes, do not take thousands of years to form, and do not emit lava that spreads slowly.