Answer:
C. One of my ancestors fought at the battle of Gettysburg.
Explanation:
Capitalization or the use of capital letters in a sentence or word is used for nouns, especially proper nouns. Moreover, it is also used to start a sentence, with names, months, days, holidays, festivals, etc.
Among the given options, sentence C has an error in the use of capitalization. The "Battle of Gettysburg" is a historical battle fought between the Union and Confederate armies. And thus, the name of the battle is a proper noun. Thus, capital letter should be used when writing the name of the battle.
Thus, the correct way to write the given sentence should be <em>"One of my ancestors fought at the Battle of Gettysburg."</em>
Thus, the correct answer is option C.
