Volcanology (eruption style): Which is the least explosive type of volcano among the options listed? Compare typical eruption styles of the given volcanic forms. Choose the correct type.

ConceptShield volcanoes erupt low-viscosity basaltic lava with gentle, effusive eruptions, making them the least explosive. Composite (stratovolcanoes) are typically more explosive; cinder cones are moderately explosive; flood-basalt plateaus involve extensive effusive events but are not single volcano types.