The antiquated machinery at the old steal mill is a danger to all of the factory’s employees.
Which of the following corrects an error in the sentence above?

"Replace steal with steel" is the correct answer. This is correct because steel is a metal, whereas steal refers to the act of taking something without permission.
"Replace machinery with machinary." This is incorrect because machine ends with an -e, so -ery is the correct suffix.
"Replace employee with employe." This is incorrect because -ee indicates a person.
"Replace factory’s with factories." This is incorrect because the suffix -ies indicates a plural form, while an apostrophe and -s indicate ownership.