Which of the following is correct?

A. While writing about oil painting showed up as early as the 12th century, it wasn't used at all in the 15th century because it dried too slowly.
B. Jan and Hubert van Eyck developed a process which layered transparent oil alternating with layers of egg tempera, to create something unique in the 15th century.
C. Oil painting can be traced back to the 7th century in Northern Europe, but because the van Eyck brothers were so proficient with it, by the 16th century, people thought the van Eycks had invented the process.
D. Jan and Hubert van Eyck are often (incorrectly) credited with the invention of oil painting, but actually, oil was used in Italy several centuries earlier to paint banners.