Watch the C Chord Pattern online guitar lesson by Stephen Mougin from Bluegrass Rhythm Evolution
In a C chord, pluck the A string, strum, pluck the D string, strum, OR: pluck the A string, strum, move 3rd finger to low E string to pluck, strum.
As I mentioned, there are two ways to do this, depending on how you feel like playing it and how you want it to sound. The moving finger version is a little "stronger" sounding because you're playing the root and fifth, while the other version uses the root/third. Use your metronome to practice each pattern, but choose one for each section of your song.