Answer: D) Ann
Explanation: Given that the whole scenario started when Ann called her sister Stacey, it means that the first sender was Ann, i.e. the first to send a message when she called her sister Stacey. Only then did Stacey call her husband to consult with him and return a call to her sister Ann. The fact that Ann initiated the communication, that is, sent an initial message in this communication, she is the one who is the first sender. Stacey as well as her husband can be classified as message recipients or audiences in the context of communication.