A person over 65 years old is experiencing age-related memory decline. A healthcare provider recommends brain training programs based on research indicating that dimensions of cognitive decline are partially reversible because the brain retains a lifelong capacity to reorganize cortical tissue. This healthcare provider's recommendation is aligned with which of Baltes' key principles of lifespan development?
a. Development has gains and losses
b. Development has socio-cultural influences
c. Development is plastic.
d. Development halts in old age.
