B. Comparison and contrast.
They are comparing Food intolerance and Food allergies.
I believe the answer is: Communication is collaborative
Which mean that in order for a communication to be formed, both the giver and receiver of the message should play their own role properly.
The giver of the message had the role to ensure the delivery of the information happen clearly, and the receiver had the role to ensure that he/she provide the necessary attention and cognitive process to receive the message.
The answer is the last option.
