The correct answer is A. Angular artery. 

The identified structure is the angular artery. After forming the superior labial branch, the facial artery becomes known as the angular artery. The pictured structure is wider caliber vessel, thus not a nerve. The superior labial artery and the transverse facial artery have lateral-medial orientations as opposed to the caudal-cephalad orientation of the angular artery/facial artery.

References:

Bolognia, Jean., Jorizzo, Joseph L.Schaffer, Julie V. (Eds.) (2012) Dermatology /[Philadelphia] : Elsevier Saunders

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