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#3fc50152
Given the signage, I must:

AProceed, so as not to cause traffic obstruction.
BStop, because I am approaching a toll booth.
CStop, obligatorily at customs.Correct
Explanation
The circular vertical sign with a red border and a black horizontal bar with the inscription Alfândega/Douane indicates the obligation to stop at the customs post. Thus, the driver must stop obligatorily upon reaching customs. The option to proceed is incorrect because this sign imposes a mandatory stop, and it is not permitted to continue without doing so. The option regarding the toll booth is also incorrect, as the mandatory stop sign at a toll booth would contain the corresponding inscription and not the indication of customs.
Explanation generated by artificial intelligence and may contain errors. Always confirm the information with your instructor.
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