According to Research, If You Are Led to Believe That

According to research, if you are led to believe that you are going to hear a lecture given by a warm and friendly instructor, you ​

A) will probably not be affected much by this expectation unless the instructor is, in fact, warm and friendly.
B) will probably perceive the instructor as being warm and friendly.
C) will probably not be affected unless you are allowed to compare the instructor to one who is cold.
D) may perceive the instructor as warm and friendly, but only if the lecture topic is interesting to you.