The city of Trenton, New Jersey, passed an ordinance making it unlawful to use any form of sound amplification on the city streets. Keller mounted a speaker on a truck. Through the speaker, he played music and spoke on a microphone while driving on city streets. Keller was convicted and fined $50. He appealed, arguing that the ordinance violated his rights of free speech and free assembly. The city claimed that the ordinance served a legitimate governmental function in keeping the city streets safe and orderly and did not prohibit or unduly restrict any particular speech. The court probably found that the ordinance was:____.

a. The court probably found that the ordinance was unconstitutional as an unreasonable restriction on fundamental rights.

b. The court probably found that the ordinance was unconstitutional under the equal protection clause.

c. The court probably found that the ordinance was constitutional under the establishment cause.

d. The court probably found that the ordinance was constitutional as a reasonable restriction on fundamental rights.