Which of the following options represents the largest-scale map?

The answer provided is indeed the largest-scale map among the options listed. In cartography, scale refers to the relationship between distance on the map and the corresponding distance on the ground. A scale of 1:1 means that one unit of measurement on the map corresponds to one unit of measurement in reality, making it the most detailed scale possible.

This large scale allows for a high level of detail and is used for situations where precision is critical, such as architectural plans or specific site surveys. As the scale denominator increases in value (like in options such as 1:100, 1:1000, and 1:10,000), the level of detail decreases because more ground area is represented by the same amount of map space. Thus, larger-denominator scales are considered smaller scales in cartographic terms. In simple terms, the larger the first number in the scale (which is always 1), the closer to reality the map represents physical features, making 1:1 the largest scale possible.