Step 1: Idea:
We can fix the order by working backwards from the last action, and ask each time what must have happened just before it.
Step 2: Start from the end.
The final goal is to show the answer, so printing (C) is last. To print a result, the result must exist, so the counting step (B) is just before it.
Step 3: Go one step further back.
To count with df.count(axis=1), the DataFrame df must exist. So loading (A) is just before (B).
Step 4: Go to the start.
To create a DataFrame in the first place, pandas must be imported. So (D) is the very first step.
Step 5: Put it together and match.
Reading forward, the chain is (D), (A), (B), (C). Only option 2 has this chain. Options 1 and 3 put (C) in the second position, and option 4 starts with (C). All of them print before there is a result.
Step 6: Extra check.
Here is a real code version of the correct order. First the line import pandas as pd is written. Next df is made, for example with pd.DataFrame, or read from a file. Then df.count(axis=1) is called to get the number of values in each row. At last print is used to show it. Any other order would raise a NameError or print nothing useful.
Step 7: Conclusion.
Option 2 is correct.
\[ \boxed{(D),\ (A),\ (B),\ (C)} \]