Question

multiple choice question
which statement about the human life span is true?

the maximum life span is 100 years.
the upper boundary of the human life span is based on the average age to which people live.
the maximum human life span has not changed since the beginning of recorded history.
in the 20th century, human life expectancy increased by 50+ years in the united states.

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Explanation:

1. Analyze the first option: The maximum human lifespan is generally considered to be around 120 years or so, not 100, so this is false.
2. Analyze the second option: The upper boundary of human lifespan (maximum lifespan) is not based on average age (life expectancy); average age is about typical lifespan, while maximum is the upper limit of how long humans can live, so this is false.
3. Analyze the third option: The maximum human lifespan has remained relatively stable (around 120 years) since recorded history, as it is related to biological limits, so this is true.
4. Analyze the fourth option: In the 20th century, US life expectancy increased, but not by 50+ years (it increased from around 47 to 78, about 31 years), so this is false.

Answer:

C. The maximum human life span has not changed since the beginning of recorded history. (Note: Here we assume the options are labeled A, B, C, D with A being the first option. If the original options have different labels, adjust accordingly. Based on the content, the third option is the correct one.)