Statement II is correct; sex-selective abortions targeting female fetuses directly reduce the number of female births relative to male births. Statement III is correct; this practice causes an unnatural change in the sex ratio at birth, resulting in fewer girls being born than would naturally occur, leading to a skewed sex ratio in the population, especially among children. Statement I, high maternal mortality, affects the survival rate of women but is not the primary driver of the skewed sex ratio at birth and in younger age groups, which is the most debated aspect of low sex ratio in India.