Which statement is consistent with the current understanding of neural tissue?

(a) A person is born with all of the neurons they will ever have.
(b) Most neurons formed in fetal development last a lifetime, but some brain regions in adults can generate new neurons.
(c) Neurons are constantly dying and being replaced throughout all regions of the brain.
(d) Stem cells in the brain become glia, which can later become neurons if there is a need for them to do so.