I posted a question similar to this yesterday and I understand how to do it now, but I want to make sure that I did this question correctly.

Answer:
Your choice is correct.
Step-by-step explanation:
magnitude = √(6² +5²) = √61 ≈ 7.81
direction = arctan(5/6) ≈ 39.81°
The polar coordinates are (7.81, 39.81°).