Which element is incorrect in this sentence?

a.“down the road” should be replaced by “until he stopped.”

b. the word “until” should be replaced by “so that.”

c. the pronoun “them” should be replaced by the pronoun “him.”

d.“a police officer” should be replaced by the words “the man.”

The incorrect element is the pronoun "them". The answer is (C) the pronoun "them" should be replaced by "him".

A pronoun is a word that is used to replace a noun in a sentence. The pronoun "them" is always used to refer to a plural noun, while the pronouns "him" and "her" are always used to refer to a singular noun. As the pronoun that comes after "stopped" is replacing the noun "man" in the sentence, the use of the pronoun "them" is incorrect because "man" is a singular noun. In that way, "them" must be replaced by "him", a pronoun that can be used to refer to a male person.  

this is b. how railways dealt with people riding the trains without paying