The answer is cutting stroke. Milady uses this exact term for the correct angle at which a razor is drawn through hair.
The other choices offered on this question — proper stroke, freehand stroke, and gliding stroke — sound plausible but aren't the specific term the textbook uses here. "Cutting stroke" is worth knowing by name since razor terminology (stroke, position, angle) shows up across multiple related exam questions, not just this one.
Milady Standard Barbering, 6th ed., Ch. 13, p. 342: "The term used to describe the correct angle of cutting with a razor is called the cutting stroke."
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More real Haircutting questions with sourced answers: What Technique Works Best on Beards With Even Density and Texture, Which Hair Design Element Matters Most for Balance.
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