Which respiratory-associated muscles would contract if you were to blow up a balloon? A)…

Which respiratory-associated muscles would contract if you were to blow up a balloon?
A) extemal intercostals would contract and diaphragm would relax
B) intemal intercostals and abdominal muscles woald contract
C) diaphragm would contract, extemal intercostals would relax
D) diaphragm contracts, intemal intercostals would relax