The answer is knotting. Milady defines knotting as the way hair is attached to the base of a hair replacement solution, with methods including single knotting, V-looping, and single hair injection.
"Looping" in the choices is a near-miss distractor — V-looping is one specific knotting method, not a synonym for the overall process. "Root-turning" is a separate, real term in the same chapter (sorting strands so the cuticle faces the right direction), which makes it a plausible-sounding but ultimately incorrect choice here.
Milady Standard Barbering, 6th ed., Ch. 15 (Men's Hair Replacement), p. 500: "Knotting refers to the way the hair is attached to the base of the hair solution. Knotting methods include single knotting, V-looping, and single hair injection into the base."
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