No X-Axis label on plot

Q&A DQ Courses
#1

Screen Link:
https://app.dataquest.io/m/469/guided-project%3A-popular-data-science-questions/10/just-a-fad

My Code: 

ax = trimester.plot(x="Quarter", y="Ratio",
                    kind="line", linestyle="-", marker="o", color="orange",
                    figsize=(24,12)
                    )

What I expected to happen:

I expected a plot with X and Y labels

What actually happened:

![image|690x354](upload://tCKuW1VEL3lo6EsBt8RWBcGlf5s.png)

As the image shows, the plot doesn’t show X-Axis labels, where is the mistake??