Belwin's 21st Century Guitar Method - The C, A minor, and D minor Chords

Belwin's 21st Century Guitar Method is a complete course that puts lessons in the context of popular styles and classic tunes. It introduces new topics at a progressive speed and uses both music notation and tablature (TAB). Correlating supplemental books integrate more advanced concepts and techniques, while keeping the learning process fun. Audio recordings include full instruction---a great resource for students and teachers alike---with demonstration and play-along tracks that will help students optimize their practice time. Detailed video lessons and fun play-along software are also available and accessible online.
For more information, visit www.alfred.com/21st.

[@felixcoolman]

Playing the C-Chord you play also the high E-String open and you play the D-Sting in the 2nd fret. Both are E-Notes and part of the C-Chord. So why do you assert, that the note E isn't part of the C-Chord?

[@shelveesmusicroom548]

You're right. But they are probably emphasising on playing root voicings. Striking the low E string while playing the C major imply an inversion of the C chord