What chord is played on the 4th fret of the 2nd string?

To determine the chord played on the 4th fret of the 2nd string, it's important to first identify what note is located on that fret. The 2nd string of a standard-tuned guitar is known as the B string.

When you press down the 4th fret of the B string, you are playing an E note. In the context of chord structures, the note E is the root of the E major chord. However, in the context of the choices provided, we need to consider which chords can include this note.

The chord that can be constructed using the E note along with other notes is A major. The A major chord consists of the notes A, C#, and E. The 4th fret on the 2nd string (B string) provides the E note, which is essential for forming the A major chord.

Thus, the correct answer is related to the presence of this note and its role in the A major chord, making it the proper choice in this question.