What should an artist consider first while selecting a brush technique?

Correct answer: The surface of the object and the desired effect

The governing principle is purpose-based technique selection. An artist first studies the surface or texture to be represented and decides what visual effect is required, such as a smooth wash, a rough texture, a fine line, or a broad mark. These decisions guide brush type, pressure, angle, and speed, so option A is correct. Price, paper brand, and the day of painting do not by themselves determine the appropriate technique.