Correct the sentence below:
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