What note do you find on the D (4th) string at the 3rd fret?

To determine the note found on the D string at the 3rd fret, it's important to understand how the guitar is tuned and how frets relate to musical notes. The D string, when played open, produces the note D.

Each fret on a guitar raises the pitch of the note by a half step (or semitone). Therefore, if you move up to the 1st fret on the D string, you play D#; at the 2nd fret, you play E; and at the 3rd fret, you reach F.

So at the 3rd fret of the D string, the note played is indeed F. This process of moving up frets and counting the half steps is essential for finding notes on any string of the guitar. By following this method, it confirms that the correct answer to the question is F.