Which of the following statements describes how french artist jacques-louis david used a neoclassical characteristic in oath of the horatii?

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he depicted a subject that teaches about history rather than moral values.

he used vibrant colors that focus the viewer's eye on the figures rather than on the painting's story.

he depicted figures that are based on sculpted figures from gothic cathedrals.

he used a background of simple classical columns and arches that don't detract from the figures.

I believe the correct answer is the final option - He used a background of simple Classical columns and arches that don't detract from the figures.
If you take a look at the painting, you will see that you cannot learn much about history because you don't know what is going on, so A is incorrect. B is also incorrect because the colors don't detract from the story. C is incorrect because we don't know if that is true. D is the correct answer because you can see in the painting that the columns are in the background, just to provide a nice view. 

February 1848 is when it was added. if that's what you were asking