To Determine the Patient's and Caregiver's Levels of Understanding of the Rationale

To determine the patient's and caregiver's levels of understanding of the rationale for obtaining the 12-lead ECG,the nurse most effectively uses which of the following statements?

A) "Can you tell me why you need this test?"
B) "Did you experience pain during the test?"
C) "Can you tell me when the test results will be shared with you?"
D) "Can you give me your name and date of birth?"