Answer:
The correct answer is letter "A": Bar Graph.
Explanation:
A Bar Graph, also known as Bar Diagram or Column Graph, is a form of portraying graphically a group of data or values and is formed by vertical or horizontal rectangular bars of proportional sizes to the values represented. Graphic bars are mostly used when the graphic portrays information of a single variable.
The best graph that would be appropriate for a single variable would be d. Time - series graph.
The main purpose of a time series graph is to show us changes to a variable over a period of time be it days, months, or years. It can therefore show data about a single variable alone.
In conclusion, option D is correct.
Find out more about time - series graphs at https://brainly.com/question/17014289.
