Which of the Following Had NOT Been Used to Explain

Which of the following had NOT been used to explain the fact that social cognitive skills tend to hold up better than non-social cognitive skills in later life?

A) The fact that the brain cortex responsible for social cognition skills ages slower than brain areas supporting non-social cognitive skills
B) The fact that social skills are practiced (exercised) everyday
C) The fact that older adults tend to have more strongly held beliefs about people when making social-cognitive decisions
D) The fact that older adults reject the use of "rules of thumb" in social cognitive decision-making