The correct answer is C
Step-by-step explanation:
This graph shows steel production in two different countries (Germany and England) during different decades. Moreover, in this graph, the y-axis (vertical axis) shows the steel production, and the x-axis (horizontal axis) shows the decades. Besides this, the countries are represented using bars of different colors and the names of the countries, and the color assigned to each is shown under the title and above the graph, which is marked with letter C. According to this, the label country belongs to the section mark as C as this is the section that explicitly includes the names of the countries and the colors used for each in the graph.