再问：OG185

185. 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.

(A)  to lead to 55 percent more delays at airports, and prompts

(B)  leading to 55 percent more delay at airports and prompting

(C)  to lead to a 55 percent increase in delay at airports and prompt

(D)  to lead to an increase of 55 percent in delays at airports, and prompted

(E)   leading to a 55-percent increase in delays at airports and prompting

答案：E

OG解释：This question poses two major problems: parallel structure and precision of expression. In E, the best choice, parallel structure is maintained in the participial phrases introduced by leading and prompting, and the phrase 55-percent increase in delays conveys the meaning more accurately than does the phrase 55 percent more delay(s) in A and B. Also, choice A lacks parallelism. In C and D the infinitive phrase to lead to ... is less idiomatic than the participial phrase leading to ... Choice C uses the singular delay where the plural is needed to indicate an increase in the number of delays; the phrase increase in delay has no exact meaning.

请问，

1. E中的a 55-percent increase in delays 为什么比A中的55 percent more delays 意思表达得准确呢？？

2. 为什么说C中的 increase in delay 没有准确的意思呢？