A couple has 10 children, all female. Which of the following best explains the situation

The situation can be explained by the fact that the sex of a baby is determined by the combination of sex chromosomes from both parents. Typically, females have two X chromosomes (XX) and males have one X and one Y chromosome (XY). Since the couple has 10 female children, it means that the father has been consistently passing on his X chromosome to all his offspring instead of the Y chromosome. This is not an unusual occurrence and is purely a matter of chance. Therefore, the best explanation for this situation would be "The sex determination was by the man's X chromosome." The other options are not relevant to the situation as there is no evidence to suggest that the man's sperm count is low, the woman is incapable of producing male children, or the sex determination was by the man's Y chromosome.