Chance is a three year old who is riding in the car with his mom home from school. he did not like what his preschool had at lunch so he did not eat anything. chance sees a mcdonals sign and starts screaming and crying that he wants fries. what does the mcdonalds sign function as?

This is an English question but the sign is a trigger to his behavior because he was fine before he saw the sign. :)

pitch- the definition of pitch is as follows:

"the quality of a sound governed by the rate of vibrations producing it; the degree of highness or lowness of a tone."