Answer:
The correct option is A. 1/4
Explanation:
Let's try to interpret the results by drawing a punnet square for the cross.
Let's consider E to be the dominant allele and e to be the recessive allele.
The cross can be shown as :
E e
E EE Ee
e Ee ee
The results from the punnet square prove that 1/4 of the offsprings will have a chance to have attached earlobes.