The answer is most likely C.) added a prepositional phrase, because the phrase "for the history lesson" is a prepositional phrase.. and "for" is the preposition.
A prepositional phrase is a phrase that contains the following elements:
A preposition: short words used to link nouns, pronouns, or phrases to other words within a sentence. Examples of prepositions are in, up, after, before, at, with, for, through.
The object of the preposition, like nouns, pronouns, gerunds, etc.
And modifiers of the object (<u>Sometimes</u>, not always).
So, the change that was made in the second sentence was the adding of the prepositional phrase " for the history lesson."
In this phrase, "for" is the preposition; "the" is the modifier of the object; and "history lesson" is the object of the preposition.
