Answer:
a. dihybrid.
Step-by-step explanation:
A cross between two individuals which involves two observed traits is known as dihybrid cross. Here in this example, the two traits are 'eye color and skin color" that is why it can be considered as dihybrid cross.
All the Mendelian laws of genetics such as "the law of dominance, the law of independent assortment and the law of segregation" are applicable on dihybrid crosses.
Similarly, crosses between two individuals which involve only one trait such as hair color will be considered as monohybrid cross while the crosses involving 3 traits will be considered as trihybrid cross.