Question

which state has viscosity and a defined volume but lacks a defined shape? liquid solid plasma gas

Explanation:

Liquids have viscosity (resistance to flow), a definite volume as the molecules are close - packed compared to gases, and take the shape of their container, lacking a defined shape of their own. Solids have a definite shape and volume. Plasma is a high - energy state with charged particles. Gases have no definite volume or shape and low viscosity.

Answer:

A. liquid