Islamic and renaissance artists often used tempera in conjunction with oil and this material, which adds a rich appearance to the work. what is that?

The answer is a.)

The technique was mural painting and he used either freshly laid or wet lined plaster. he also use water to merge it with the pigment and plaster creating a internal part of the wall

D. exterior reflects the interior, : )

If your choices are: -cropping  -anti-aliasing-imperfection-contrastdownsampling is done to decrease the bit rate when transmitting over a limited bandwidth or to convert to a more limited audio format. this is the opposite of upsampling. so the answer is contrast.