Answer to Question 1
B
The rate of a sinus rhythm is between 60 and 100 beats/min.
Answer to Question 2
C
Characteristic ECG findings in Wolff-Parkinson-White syndrome include a short PR interval, QRS widening, and a delta wave. A delta wave is an initial slurred deflection at the beginning of the QRS complex that results from the initial activation of the QRS by conduction over the accessory pathway.