The depressed area labeled by the letter D is occupied by a muscle.
The area in question corresponds to the iliac fossa. The iliac fossa is a large, concave surface on the internal side of the ilium bone. Residing in this space is a very large muscle known as the psoas iliacus muscle. Also known as the Iliopsoas muscle, it is a long, thick muscle that provides support for the front of the hip, among many other functions.
Tendons and ligaments are not found within the iliac fossa given that they correspond to joints and muscle insertions, and although a muscle is found in this space, it does not insert itself there. Within this fossa, we can also find nerves, however, due to its large size, the Iliopsoas muscle is the most likely element amongst the options listed to be found in the iliac fossa that is marked by the letter D.
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