Discussion
The mean length of generation is affected by
Answer: C
The mean length of generation is affected by overall fertility and mortality levels and by how fertility is spread over the age-specific rates.
The mean length of a generation is the average age of mothers at the birth of their daughters. It is worked out from the age-specific fertility rates weighted by the survival of the daughters, so it depends on the level of fertility and mortality, and on the share of fertility that falls in each age group.
The first option names only fertility and the reproductive span, leaving out mortality. The second names the gross reproduction rate, which is a summary and not a determinant. The fourth names the age at marriage, which affects the timing but is not the factor that determines the mean length of generation.
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