How was the public initially exposed to news of
meat companies' unsafe practices?

The Jungle

Explanation:

It was a novel published by a muckracker to expose the meat companies unsafe practices.

freedom of speech is also protected by the 1 amendment.

explanation:

here is pretty much what the 1st amendment says:

congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the government for a redress of grievances.

hello,

the steamboat is your answer.

it seems like its the only form of transportation on the choices.