The correct answer is D. Horizontal mattress.

The incision shown here has been closed with horizontal mattress sutures.  This technique eliminates dead space, decreases wound edge tension, and provides hemostasis (Horizontal = Hemostasis). A “locking” variant of the horizontal mattress suture has also been described.
There is a risk of strangulation if the sutures are tied too tightly.

The other suture techniques listed here are not shown in this picture.

References: Hanasono MM, Hotchkiss RN. Locking horizontal mattress suture. Dermatol Surg. 2005 May;31(5):572-3. doi: 10.1111/j.1524-4725.2005.31163. PMID: 15962744.

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