The answer tries to answer "how many" rather than "how much" of delays...
When you are using 55 percent more
delay then it means that if you used to have 100 hours of delay earlier then now you are having 155 hours of delay.
But when you say 55 percent increase
as in E, it clearly brings in the quantitative number of flights into picture. This basically means if earlier there were 100 flight delays earlier, now there would be 155 late flights.
The recent surge in the number of airplane flights has clogged the nation's air-traffic control system, to lead to 55 percent more delays at airports, and prompts fears among some officials that safety is being compromised.
(B) leading to 55 percent more delay at airports and prompting
(E) leading to a 55-percent increase in delays at airports and prompting
What is difference between "55 percent more delay" and "a 55-percent increase in delays"
delays are increased by a given percentage not by more or less. So between B and E, E wins.
If you know what you're worth, then go out and get what you're worth. But you gotta be willing to take the hits, and not pointing fingers saying you ain't where you wanna be because of anybody! Cowards do that and You're better than that!
The path is long, but self-surrender makes it short; the way is difficult, but perfect trust makes it easy.
Fire the final bullet only when you are constantly hitting the Bull's eye, till then KEEP PRACTICING.
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