When the Handwritten Autobiographies of 180 Catholic Nuns Were Studied

When the handwritten autobiographies of 180 Catholic nuns were studied, the researchers found that:

A) the nuns that had a higher standard of living throughout adulthood lived, on average, nine years longer than those with lower standards of living.
B) cheerfulness, contentment, and gratitude cause a person to live a longer and healthier life.
C) 22-year-old nuns expressing positive emotions, on average, lived nine years longer than nuns with the fewest positive feelings at age 22.
D) there were no correlations between autobiographies written at the age of 22 and longevity.