This sign...

A)Requires switching on at least the dipped beam headlights.Correct

B)Requires switching on the dipped beam headlights until the tunnel has been passed.

C)Requires switching on the main beam headlights.

This sign requires drivers to drive with the dipped beam headlights at least, regardless of visibility conditions, with the option to use main beam where applicable.
This obligation continues until the following sign is encountered:

←Manual B de la DGT [TT/English]

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