Final answer:
The origin of the hip extension muscle is the ischial tuberosity.
Step-by-step explanation:
The origin of the hip extension muscle is the ischial tuberosity. The ischial tuberosity is a large, roughened area of the posterolateral portion of the hip bone.
It serves as the attachment point for the posterior thigh muscles and also carries the weight of the body when sitting. Therefore, the correct answer to your question is option 1) Ischial tuberosity.