Use the Following Information to Answer Following Questions

Use the following information to answer Following Questions . A 70-year-old woman had an electrocardiogram performed at her annual checkup, and the following lead II recording was made.
-According to Einthoven's Law, if the QRS voltage in lead III is 0.4 mV, what is the QRS voltage in lead I?

A) 0.05 millivolts
B) 0.50 millivolts
C) 1.05 millivolts
D) 1.25 millivolts
E) 2.05 millivolts