Which type of graph is best used for tracking the trend of a single object over time?

A line graph is the ideal choice for tracking the trend of a single object over time because it effectively displays data points along a continuous scale, allowing for a clear visualization of changes and trends. Each point on the graph represents a data value corresponding to a specific time, and the line connecting these points shows the progression or regression of the object's value over that time period. This format makes it easy to identify patterns, fluctuations, and overall trends, which are essential for analyzing the behavior of the variable being measured.

In comparison, a bar graph is better suited for comparing discrete categories rather than showing trends over time. A pie chart represents parts of a whole at a specific moment in time and does not convey changes over time. A histogram is utilized for displaying the distribution of numerical data and is not advisable for illustrating trends of a single object since it focuses on frequency distribution rather than changes in value over time.