Varnish is a method to preserve both photographs and artworks created with pastels. Thus option A is correct.
What are pastels?It is able to make large strokes that resemble solid, rich oil paints, or it can be used to make fine lines and traces that resemble any sketching tool. The variety of colors and the paintings' ability to mix them add to their beauty.
Oil pastels seldom dry out or cure since they are manufactured utilizing non-drying fluids and wax. Although they can still be worked on forever, this trait makes reglazing very impossible because succeeding layers do not stick to these pastels effectively. Images and pastel drawings can both be preserved with a varnish.
Varnish, a transparent, colorless liquid with a fluid with either an artificial or natural epoxy, has also been applied on art pieces for millennia and, more generally, acrylic canvases as a barrier against humidity and toxins. Therefore, option A is the correct option.
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