The correct answer is: B. plt.plot()
The plot method on Series and DataFrame is just a simple wrapper around the plt.plot() function from the matplotlib library. This means that when you call the plot() method on a Series or DataFrame, it will internally call the plt.plot() function to create a plot of the data.
The plt.plot() function takes a number of arguments, including the data to plot, the type of plot to create, and the style of the plot. The default values for these arguments are sufficient for most use cases, but you can also specify your own values if you need to.
For example, the following code will create a line plot of the values in the df DataFrame:
df.plot()
This will create a plot with a blue line, with the x-axis values on the bottom and the y-axis values on the left.
You can also use the plot() method to create other types of plots, such as bar plots, scatter plots, and histograms. For more information on the plt.plot() function, see the matplotlib documentation.
The other options are incorrect because they are not functions in the matplotlib library.