Understanding Factors Affecting Sex Ratio

The sex ratio is typically defined as the number of males per 100 females in a population. Several demographic factors can influence this ratio. This question asks to identify the correct factors from the given list.

Analysis of Factors

• A. Sex differentials in enumeration: This refers to differences in how accurately males and females are counted or recorded in censuses or surveys. Under- or over-counting of one sex can affect the observed sex ratio.
• B. Sex ratio at birth: This is the ratio of male births to female births, which is a fundamental determinant of the sex composition of a population from the outset.
• C. Sex differentials in migration: While differences in migration patterns between males and females significantly impact a region's sex ratio, this factor is not included in the correct option according to the provided answer.
• D. Sex differential in mortality: Differences in death rates between males and females also heavily influence the sex ratio, particularly in older age groups. However, like migration, this factor is excluded based on the provided answer.

Based on the provided correct answer (Option B), the factors considered correct are the sex differentials in enumeration (A) and the sex ratio at birth (B). These factors directly influence how the sex ratio is measured and its initial composition.

Conclusion

The question, along with the given options and the identified correct answer, points to factors A and B as the correct influences on the sex ratio in this specific context.

Therefore, the correct option is the one that includes only A and B.