A Patient with Abdominal Muscle Weakness Is Having Difficulty Developing

A patient with abdominal muscle weakness is having difficulty developing an effective cough. Which of the following phases of the cough reflex are primarily affected in this patient?
1) Irritation
2) Inspiration
3) Compression
4) Expulsion

A) 1, 2, and 3 only
B) 2 and 4 only
C) 2, 3, and 4 only
D) 3 and 4 only