The answer is cowlick. Milady defines a cowlick as a tuft of hair that stands straight up, most noticeable at the front hairline but capable of showing up anywhere on the scalp.
The other two growth-pattern terms in the choices are related but distinct: a whorl is hair that grows in a circular or swirl pattern (most often at the crown), and a hair stream is the general direction hair flows in. Vellus hair is a hair-type term (short, fine, unpigmented body hair) with nothing to do with growth-pattern shape.
Milady Standard Barbering, 6th ed., Ch. 10 (Properties and Disorders of the Hair and Scalp), p. 257: "A cowlick is a tuft of hair that stands straight up. Cowlicks are usually more noticeable at the front hairline, but they may be located anywhere on the scalp."
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