Which among the following is the formula for continuity equation?

• A. ‚âà√¨‚àö√ñ(x)V(x)A(x) = Constant
• B. A(x) = Constant
• C. ‚âà√¨‚àö√ñ(x)V(x) = constant
• D. P(x)V(x) = constant