27、Recently documented examples of neurogenesis, the production of new brain cells, include the brain growing in mice when placed in a stimulating environment or neurons increasing in canaries that learn new songs.
(A) the brain growing in mice when placed in a stimulating environment or neurons increasing in canaries that
(B) mice whose brains grow when they are placed in a stimulating environment or canaries whose neurons increase when they
(C) mice's brains that grow when they are placed in a stimulating environment or canaries' neurons that increase when they
(D) the brain growth in mice when placed in a stimulating environment or the increase in canaries' neurons when they
(E) brain growth in mice that are placed in a stimulating environment or an increase in neurons in canaries that
