Final answer:
A) The correct row identifies pure breeding guinea pigs for both hair color and hair type.
Step-by-step explanation:
The row that identifies pure breeding guinea pigs for both hair color and hair type is A) The correct row.
A pure breeding guinea pig is one that, when crossed with another of the same phenotype, consistently produces offspring with the same phenotype.
In this case, hair color and hair type are both determined by specific genes.
Therefore, if the guinea pigs in the row have the same hair color and hair type, and when crossed with another guinea pig of the same phenotype always produce offspring with the same hair color and hair type, then they are pure breeding for both traits.