Answer:
C.
Step-by-step explanation:
A flat affect can be defined as a facial expression that shows no signs of emotions. A person with a flat face lacks emotional expressiveness. Such people usually speak in a monotonous voice with less facial expression and apathetic.
In the given case, the client's facial expression can be defined as a flat. It is because, as stated above, the client shows the traits of flat affect. The client speaks in monotonous tone, is absent in terms of affective expression.
So, the correct answer is option C.