Answer: The object of the preposition by means of is "protest".
Explanation:<u> The object of the preposition is a noun or a pronoun that completes a prepositional phrase</u> which has been introduced by a preposition. Most times, this noun or pronoun is found to the right of the preposition. Moreover, in some cases, a gerund can also function as object of the preposition, In the sentence provided,<u> the object of the proposition is a noun ("protest") and it is found to the right of "by means of". </u>
Every is a determiner. Summer is a noun. Many is an adjective. Americans are subjects. Happily is an adverb. Attend is a verb. Baseball games are nouns. In is a preposition. and stadiums are nouns.
I believe it’s d.
Correct me if I’m wrong ❤️