Question

which of the following is a graph of a single variable?
graph a
graph b
graph c
a. graph a
b. graph b

Explanation:

Step1: Analyze Graph A

Graph A has two variables: years (2005 - 2015) and sales of automobiles (in millions). It shows a relationship between these two variables.

Step2: Analyze Graph B

Graph B has two variables: different firms (U.S., Japanese, European, Korean) and a numerical value (likely a count or measurement). It compares values across different firm - types.

Step3: Analyze Graph C

Graph C has only one variable: the proportion of different firms (European, Japanese, U.S., Korean) in a whole. It represents the composition of a single entity (the market share of firms) as a single variable (the percentage of each firm type in the total).

Answer:

C. Graph C