What is the name of the dome-shaped muscle that forms a partition between the thorax and abdomen?

Question

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The diaphragm is a large, dome-shaped muscle that forms the primary muscle of respiration and separates the thoracic cavity from the abdominal cavity. A) Erector spinae is a group of muscles located in the back that help maintain an upright posture. B) Rectus abdominis is a long flat muscle that runs vertically down the abdomen and helps to flex the trunk. D) Rotator cuff is a group of muscles and tendons that help to stabilize the shoulder joint.

What Is the Name of the Dome-Shaped Muscle That Forms