Which of the Following Is Used by the Text Author

Which of the following is used by the text author to explain why people exhibit differences in metabolic efficiency?

A) Metabolic efficiency is advantageous for surviving a famine.
B) Obesity is a trait that does not lead to health disorders.
C) The excessive accumulation of fat is a social proxy for wealth.
D) Obesity allowed hunter-gatherers to forage for long periods of time.
E) The pressure to avoid obesity was greater than the selective pressure to avoid starvation.