The Rhythm Strip Reveals the Following Findings:all P Waves Are

The rhythm strip reveals the following findings:all P waves are upright and normal in appearance and occur before every QRS complex,the P-R interval is between 0.12 and 0.20 second,the QRS complexes are identical,the QRS complex is between 0.04 and 0.10 second,the R-R interval is regular,and the HR is between 60 and 100 bpm.These findings BEST describe which of the following?

A) Sinus bradycardia
B) Sinus tachycardia
C) Normal sinus rhythm
D) Atrial arrhythmia