In Turner’s syndrome, the chromosome complement is 45; XO. This means that individuals with Turner’s syndrome have a missing or partially missing sex chromosome, specifically one of the X chromosomes. The "45" in the chromosome complement refers to the total number of chromosomes present in the individual, which is less than the typical 46 chromosomes found in most humans. The "XO" indicates that there is only one X chromosome present, instead of the usual two X chromosomes in females.

Let`s dissect the other options for better understanding:

Option 1: 47; XXY - This combination of chromosomes is found in individuals with Klinefelter syndrome, not Turner`s syndrome. In Klinefelter syndrome, individuals typically have two X chromosomes and one Y chromosome.

Option 3: 46; XX - This is the normal chromosome complement for females, with two X chromosomes. It is not associated with Turner`s syndrome.

Option 4: 47; XYY - This combination of chromosomes is found in individuals with Jacobs syndrome, not Turner`s syndrome. In Jacobs syndrome, individuals typically have two Y chromosomes and one X chromosome.

Based on this analysis, the provided answer (option 2) is correct.