Haemophilia is a genetic disorder that affects the blood`s ability to clot properly. It is mostly associated with royal families. Option 2 is the correct answer because historically, haemophilia has been more prevalent among European royal families. This is because the disorder is inherited through the X chromosome, and members of royal families often intermarried, leading to a higher chance of passing on the affected gene. However, it is important to note that haemophilia can occur in any population and is not exclusive to royal families. It is a misconception that haemophilia is associated with labourers, miners, or sportsmen. These occupations do not have a direct correlation with the occurrence of haemophilia.