Which of the following reflects the third step of effective communication?
a.
kyle is practicing his spanish on his friend.
b.
pearl is listening to country music for the first time.
c.
erin is giving a lecture on heart disease, in which she is using medical terms, to a classroom of medical students.
d.
jessica is trying out for the school’s production of hamlet.

The correct answer for this question is this one: "Erin is giving a lecture on heart disease, in which she is using medical terms, to a classroom of medical students."
The statement that reflects the third step of effective communication is that Erin is giving a lecture on heart disease, in which she is using medical terms, to a classroom of medical students.
Hope this helps answer your question and have a nice day ahead.

Use who. if it wasn't a question, you could put the he in the blank.  if you can put he or she in the blank, it's who.if you can put him or her in the blank, it's whom.