Answer:
Option D
Step-by-step explanation:
The following muscles play an important role in breathing
a) Thin skeletal muscle at the base of chest i.e Diaphragm
b) Muscle between the ribs i.e intercostal muscles
c) The muscles in the neck
d) Abdominal muscle
In terms of physical characteristics, air pressure is essential to take in air and also assures that it reaches to the lungs. The pressure is regulated and controlled by diaphragm movement.
However, muscles connected to lungs have no role in respiration.
Hence, option D is correct