Answer:
The correct option is preposition.
Explanation:
Prepositions are short words, often less than six letters used to connect people, objects, time and locations within a sentence. They are normally placed in front of nouns, or in front of gerund verbs in some cases, and in general, they can be grouped in three types: (1) time prepositions, (2) place prepositions, and (3) direction prepositions.
Bearing the described above, it could be said that the word UPON in the sentence: Four score and seven years ago, our forefathers brought forth (upon) this continent a new nation conceived in liberty and dedicated to the proposition that all men are created equal. corresponds to a preposition
