You have prepared Mrs. White's vitamin B12 shot, performing the "triple check," and are about to administer it when an emergency occurs in the next patient exam room and you are called to assist. You place the prepared injection in a drawer and lock it, then leave the room. When you return, Mrs. White is still waiting patiently. What should you do next?

a. Offer to change Mrs. White's appointment, since so much time has been lost
b. Discard the prepared injection and start over
c. Thank Mrs. White for waiting and proceed from the point at which you left off
d. Apologize for the delay and administer the injection you have prepared
e. Check the order and the injection again, and then administer the injection