Which information is most useful to record on a sample sheet during systematic brush-technique practice?

Correct answer: Brush type, pressure, angle, moisture and resulting effect

The governing learning concept is controlled observation: record the variables that cause a stroke and the visual result they produce. Brush type, pressure, angle, and moisture can be compared with the resulting mark, so Option B supports repeatable learning. A, C, and D may be useful records, but alone they cannot explain why one stroke worked differently from another.