Read the paragraph from a student's essay on aging.
When centenarians, people at least one hundred years of age, are asked to talk about their secrets to longevity, their
answers vary widely. Some attribute their long lives to hard work; others say that avoiding junk food has kept them going.
Many doctors believe that heredity is not the most significant factor in determining length of life.
Which sentence would best support the underlined sentence in the paragraph?
Many centenarians have little or no knowledge of their family medical histories.
Most centenarians have maintained close relationships with their families and friends.
Traits passed across generations can dramatically affect the length and quality of lives.
Numerous studies show that overall lifestyle has the greatest influence on life expectancy.