Public transportation in metropolitan areas should be shut down during...
(A) Driving to the city is much faster than taking the train.
This statement is not necessarily true based on the claim. While it is mentioned that weekend commuters prefer driving their own cars for flexibility and time-savings, it doesn't explicitly state that driving is much faster than taking the train. The claim only suggests that commuters perceive driving as faster, but it may not be a factual comparison.
(B) Taking the train is not less expensive than driving a car.
The claim does not provide any information about the cost comparison between taking the train and driving a car. It states that weekend commuters prefer driving for flexibility and time-savings, but it doesn't mention anything about the cost. Therefore, this statement is not necessarily true based on the claim.
(C) There are plenty of parking spaces available in the city.
The claim does not provide any information about the availability of parking spaces in the city. It focuses on the preferences and perceived advantages of weekend commuters who choose to drive their own cars. Thus, the statement about the availability of parking spaces is not necessarily true based on the claim.
(D) All metropolitan residents who need to go to the city on weekends have a car at their disposal.
This statement must be true based on the claim. The claim assumes that weekend commuters prefer driving their own cars to the city. Therefore, it can be inferred that all metropolitan residents who need to go to the city on weekends have a car at their disposal.
(E) Commuting by train is quicker and more flexible during the work week.
The claim specifically focuses on the preferences and perceived advantages of weekend commuters who choose to drive their own cars. It doesn't provide any information about commuting by train during the work week. Therefore, this statement is not necessarily true based on the claim.
To summarize, based on the claim, only option (D) must be true, as it aligns with the assumption that all metropolitan residents who need to go to the city on weekends have a car at their disposal. The other statements (A, B, C, and E) are not necessarily true based on the information provided in the claim.