Following Questions : a 60-Year-Old Woman Had the Following EKG

Following Questions : A 60-year-old woman had the following EKG recorded at a local emergency room following an automobile accident. Her weight was 70 kg and her aortic blood pressure was 140/80 mmHg.
-What is the heart rate using lead I for the calculation?

A) 75
B) 88
C) 100
D) 112
E) 148