The iliacus and the psoas major muscles are collectively known as the muscle because they share a common insertion on the of the femur. a- iliopsoas; lesser trochanter b- iliopsoas; greater trochanter c- psoasiliacus; greater trochanter d- psoasiliacus; lesser trochanter

The correct option is A- iliopsoas; lesser trochanter.

Explanation:

The Iliopsoas muscle is formed by the iliacus muscle and the psoas muscle. The Psoas is located in the abdominal cavity, behind the internal organs and in front of the pubic bone, it is subdivided into psoas major and psoas minor. It originates in the last dorsal vertebra and all lumbar.  The Iliacus is a flat and triangular muscle that originates from the inner surface of the sacrum and ilium bone. Both are inserted through a common tendon in the proximal femur. The direction of its fibers is down with a posterior and external twist to reach the femur in its lesser trochanter.

doctors i believe if i'm wrong sorry