Alarge, dome-shaped muscle which acts as a partition between the thoracic and abdominal cavities:
a. intercostals
b. transverse abdominis
c. diaphragm
d. rectus abdominis

c. diaphragm

Explanation:

The diaphragm is a skeletal striated muscle that separates the abdominal from the thoracic cavity and is primarily responsible for breathing in humans. It is present in all mammals and some birds.

In humans, this muscle is located near the lumbar vertebrae, lower ribs, and sternum, and attaches to these structures through peripheral tendons. It is covered by the peritoneum in its inferior part, in its superior part, is adjacent to the parietal pleura.