Question

test major bones
options: sacrum, femur, scapula, pelvis

Explanation:

The highlighted bone in the image (blue - colored) is the sacrum. The sacrum is a triangular bone at the base of the spine, between the two hip bones. The femur is the thigh bone, the scapula is the shoulder blade, and the pelvis is a broader structure including the hip bones and the sacrum's attachment, but the highlighted one matches the sacrum's location and appearance.

Answer:

A. sacrum