There is a sentence that is missing in the paragraph below. Look at the paragraph and decide where (option 1, 2, 3, or 4) the following sentence would best fit.

Sentence: Taken outside the village of Trang Bang on June 8, 1972, the picture captured the trauma and indiscriminate violence of a conflict that claimed, by some estimates, a million or more civilian lives.

Paragraph: The horrifying photograph of children fleeing a deadly napalm attack has become a defining image not only of the Vietnam War but the 20th century. ___(1)___. Dark smoke billowing behind them, the young subjects’ faces are painted with a mixture of terror, pain and confusion. ___(2)___. Soldiers from the South Vietnamese Army’s 25th Division follow helplessly behind. ___(3)___. The picture was officially titled “The Terror of War,” but the photo is better known by the nickname given to the naked 9-year-old at its centre: “Napalm Girl”. ___(4)___.

To determine where the given sentence fits best, we must consider the logical flow of ideas between sentences. The sentence in question provides important historical and contextual information about the photograph. The author begins by describing the image and ends the paragraph by mentioning the official title of the photo. While sentences offering historical context are typically placed at the beginning, inserting the sentence in either Blank 1 or 2 would create a disruption in the flow of the image's description. This suggests that the sentence must fit in either Blank 3 or 4. Offering contextual information after mentioning the title at the end seems odd; thus, we can eliminate Blank 4. 

When we refocus on Blank 3, we see that by this point in the paragraph, the author has just described the soldiers from the South Vietnamese Army’s 25th Division following behind the children. This sets up a moment of helplessness that emphasises the chaos and brutality of the scene. The sentence about the trauma and violence of the war logically follows the description of the soldiers because it explains the broader implications of the photo’s content, providing a context for the violence and its far-reaching consequences. After discussing the soldiers, the sentence connects the personal and immediate suffering in the photograph with the larger scope of the Vietnam War’s impact, which then leads into the official title of the photograph. The official title, "The Terror of War," is directly linked to the broader theme of violence and destruction that the sentence describes. Thus, the given sentence naturally sets the stage for introducing the official title and the iconic nickname, "Napalm Girl," ensuring a smooth and coherent transition.

Hence, Option C is the correct choice.