A. Flyville is known to experience prolonged spells of fog and even technical failures during winter.
Correct, this shows us how even the new runway won't be able to solve the problem of congestion and delays.
B. Historical data from similar airports that have constructed additional runways shows no significant improvement in flight delay times or congestion relief.
Incorrect, similar airports mean airports similar to Flyville and historical data on these airports show negative results, this seems a weakener too but not as great as the first one. It is not a great weakener because what has happened in the past might not repeat in future whereas first option's fog is a
known experience for Flyville, hence, likelihood is higher in first option.
C. Reduction in flight delays and traffic congestion does not necessarily translate into increased revenue.
Incorrect, this talks about another conclusion: Reduction in delays --> Increase in revenue. Our main conclusion of the argument is: Construction of new runway --> Reduction in delays and Revenue increase.
D. Parallel runways will increase the workload of air traffic controllers and cause manpower constraints.
Incorrect, this doesn't talk about the revenue at all and highlights other issues.
E. A recent feasibility study indicates that the projected increase in revenue from the new runway would be offset by the substantial increase in maintenance and operational costs.
Incorrect, this strengthens the argument by indicating that revenue is projected to increase.