GMAT Verbal & Essays

Varieties of influenza range in severity from mild flus, treatable with bed rest and lasting only a few days, to acute forms, such as bacterial pneumonia, that are potentially fatal.


A) mild flus, treatable with bed rest and lasting only a few days, to

B) mild flus, treatable with bed rest and last only a few days, to

C) mild flus, treatable with bed rest, and they last only a few days, to

D) those mild flus, able to be treated with bed rest and in duration only a few days, to those

E) those mild flus which are treatable with bed rest and which last only a few days to those

A is the correct answer but i dont understand the explanation given by princeton

"Yes. This is parallel."

i got this right because it just sounds right but can someone tell me why "lasting" is parallel in this sentence

Treatable & lasting are both adjectives. Last in the sentence is a verb.