What is the most likely meaning of the metaphor in the following sentence?
The teacher listened with a wooden face as the student gave excuses
for not having done his homework,
A. The metaphor comparing the teacher's face to a piece of wood
suggests that the teacher is not a kind person
B. The metaphor comparing the teacher's face to a piece of wood
suggests that the teacher is a carpenter
C. The metaphor comparing the teacher's face to a piece of wood
suggests that the teacher is not sympathetic to the student's
excuses
D. The metaphor comparing the teacher's face to a piece of wood
suggests that the teacher does not care about the student's
homework