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
D E 不知怎么选择，有什么区别呢？
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