Why is the need for a dry surface prior to developer application more of a disadvantage with a dry developer than with a non-aqueous wet developer?

• A. Because the dry developer only forms a thin film on the surface of the test piece
• B. Because the solvent in a non-aqueous wet developer penetrates deeper into discontinuities to contact entrapped penetrant and draw it back out
• C. Because the warm test piece causes evaporation of the solvent in the nonaqueous developer
• D. All of the above