Put the “asthma severity” descriptors below in the right order, starting from the least serious one.
a. Severe Persistent
b. Mild Persistent
c. Intermittent
d. Moderate Persistent

A. 1-c, 2-d, 3-a, 4-d

B. 1-a, 2-b, 3-c, 4-d

C. 1-c, 2-b, 3-d, 4-a

D. 1-b, 2-d, 3-a, 4-c