Final answer:
Oil paintings require a drying time of at least six months to a year before being safely framed under glass, with drying times varying based on the paint thickness.
Step-by-step explanation:
The question is asking for the amount of time oil paintings should be allowed to dry before being framed under glass. The correct answer is d) Year. Oil paintings take a very long time to dry because the paint layers are thick and the oil medium dries much slower compared to acrylics or watercolors. It is generally recommended that oil paintings should dry for at least six months to a year before framing, but this can be longer depending on the thickness of the paint. It is crucial to ensure that the paint is completely dry to prevent any potential damage that could occur from trapping moisture under the glass when it is framed.