From the evolutionary perspective, sex differences in partner preference stem from unequal parental investments.
The correct option is b.
Sex differences are based on biological causes. These include the ability to reproduce, levels of sexual hormones, the expression and consequences of genes on the X and Y chromosomes, and the higher body fat percentage in women. Gender, on the other hand, is linked to behaviour, way of life, and life experience.
Parental investment in an offspring is any investment a parent makes to enhance the chance of that child's survival and reproduction at the expense of that parent's capacity to invest in other offspring, as initially defined by Robert Trivers (either current siblings or future ones).
To learn more about parental investments, refer
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