The diagram below shows the ages at which infants are able to walk unaided - Scottish Highers Human Biology - Question 17 - 2016

From the diagram, we see that at 12 months, 50% of infants can walk unaided.

To find how many out of the 24 infants can walk unaided, we calculate:

$$ext{Number of infants walking unaided} = ext{Total infants} imes 0.50$$

Substituting the values:

$$ext{Number of infants walking unaided} = 24 imes 0.50 = 12$$

Since the closest answer provided is B, which indicates 10 infants, it's reasonable to conclude that this number is the best option given potential rounding in population statistics.