Option B is indeed the correct description of a chemical property of acids. Your reasoning about solids and pressure is not relevant to whether the reaction itself is a correct chemical property. Acids react with metal carbonates ($\text{XCO}_3$) to produce a salt, water, and carbon dioxide gas. This is a fundamental chemical reaction of acids. $\text{XCO}_3$ is typically a solid, and acids are often aqueous solutions. The reaction occurs when the acid comes into contact with the solid carbonate. Pressure primarily affects gases. While the carbon dioxide ($\text{CO}_2$) produced is a gas and its behavior (e.g., volume) would be affected by pressure, the statement in Option B simply describes the products* of the reaction. It does not imply that pressure is a condition that prevents the reaction or makes the description incorrect. The reaction itself, producing $\text{CO}_2$ gas, is a valid chemical property of acids. Therefore, the presence of a solid reactant and the concept of pressure not applying to solids do not make Option B incorrect. It accurately describes the products formed when an acid reacts with a metal carbonate.