You sit down and talk to Mrs. Fredrich to inform her of the latest test​ results. "Mrs. Fredrich, your results show that you are experiencing clinical manifestations consistent with digoxin​ toxicity." Mrs. Fredrich​ responds, "Really" I​ don't understand how that could​ be." Which statement indicates that Mrs. Fredrich requires further teaching about​ self-administration of​ digoxin?
a. "I've been taking my digoxin exactly as prescribed, so I don't see how this could happen."
b. "I didn't think it was possible to experience digoxin toxicity when following the recommended dosage."
c. "I've been taking my digoxin with my other medications as usual, so I'm not sure how this could be happening."
d. "I thought I was doing everything right with my digoxin, so I'm surprised to hear this news."