The primary purpose of any postal service is communication (secure delivery of hard-copy) between a government and its citizens.
All else: commercial advertisements, consumer goods, love letters, bank statements, et cetera... are secondary. Personally important, but secondary.
It is the reason roads are established (to insure effective, efficient delivery), and postal employees are sworn officers of the State.
Hence, the need for government monopoly. Even if it operates at a net loss, like Defense Departments.
So: Option A.
Full Disclosure: I am a US postal employee; and one of those whacky guys who thinks our Congressional Record should be mailed weekly to every registered voter in the country.
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