Final answer:
The correct answer is: A. Amount of carbon dioxide gas (in kilograms), x-axis, as the independent variable is plotted on the x-axis, while the dependent variable (number of flower petals) should be plotted on the y-axis.
Step-by-step explanation:
Jose completed an experiment that compared the amount of carbon dioxide gas given to a flower and how many petals the flower produced. In this scenario, the amount of carbon dioxide gas is the independent variable because it is the condition that is being controlled or manipulated. On the other hand, the number of flower petals produced is the dependent variable because it is the outcome being observed and measured in response to changes in the independent variable.
Accordingly, the independent variable should be placed on the x-axis and the dependent variable on the y-axis. This follows the convention that the x-axis represents the independent variable while the y-axis represents the dependent variable. Therefore, the correct answer to the question is: A. Amount of carbon dioxide gas (in kilograms), x-axis.