Critical Reasoning (CR) | Re: A private bus company gained greater profits and provided bus service

Negating D
lets say driving them will be MORE difficult. How much difficult a bit more or They can't drive at all.

If a bit more difficult Cool The buses still work, Generate good ridership, in turn good revenue and profits.
If they can't drive at all. Why to buy it.

So ambiguous option won't gurantee to destroy conclusion on negating.

Answer must be D.

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