Why is it desirable that microscope objectives be parfocal

answer; (d) none of the above;

answer: musical connotation

leonard b. meyer (1918-2007) was an american composer, author and philosopher. his work emotion and meaning in music is perhaps the first major treatise on music. it is a philosophical and psychological work, greatly influenced by koffka (one of the major proponents of gestalt psychology). his work deals with the problem of musical meaning and musical communication.

it should be d or b but i'm sure it's d

answer; obey the closest relative's wishes;