[求助]是和原文的精确性有关吗？

Since the deregulation of airlines, delays at the nation's increasingly busy airports have increased by 25%. To combat this problem, more of the takeoff and landing slots at the busiest airports must be allocated to commerical airlines.

Which of the following, if true, casts the most doubt on the effectiveness of the solution proposed above?

A The major causes of delays at the nation's busiest airports are bad weather and overtaxed air traffic control equipment.

C Over 60% of the takeoff and landing slots at the nation's busiest airports are reserved for commerical airlines.

Key:

Since the deregulation of airlines, delays at the nation's increasingly busy airports have increased by 25%. To combat this problem, more of the takeoff and landing slots at the busiest airports must be allocated to commerical airlines.

Which of the following, if true, casts the most doubt on the effectiveness of the solution proposed above?

A The major causes of delays at the nation's busiest airports are bad weather and overtaxed air traffic control equipment.

C Over 60% of the takeoff and landing slots at the nation's busiest airports are reserved for commerical airlines.

Key: A

按照有关无关来选，我知道A 是有关且驳斥的，但是我对C拿不准，不知道该怎样去排除，是用原文的精确性吗？原文告知是more of the takeoff and landing slots 而不是60%，还是这一选项根本与原文无关。

望大家指教！