As an Infant,Baby Sarah Had Typical Childhood Illnesses and No

As an infant,Baby Sarah had typical childhood illnesses and no significant earaches.However,Sarah is now 4 years old and she is experiencing frequent earaches.What is the most likely reason for this?

A) Sarah attends preschool and picks up many more infectious bacteria and viruses than she did at home.
B) Sarah attends preschool,and the noise level of the other children playing aggravates her hearing and gives her earaches.
C) Sarah's eustachian tube has moved position from almost parallel to the ground at birth to a more angular position,and this change sometimes leads to an increase in earaches.
D) Sarah has developed an allergy to the shampoo her mother uses to wash her hair,and the result is inflammation in her eustachian tubes.