Fra Angelico, Sandro Botticelli, and Giotto illusion of space?

Ithink that c would make the most amount of sense.

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.

Douglas s freeman wrote an account of the life of robert e lee