Answer:
C. overgeneralization.
Step-by-step explanation:
-Undergenerization refers to using words in a limited form.
-Underutilization is about not using something to the full potential it has.
-Overgeneralization refers to using one experience to generalize all.
-Word syntaxis is about the right structure of words to form a correct sentence.
According to this, the fact that he thinks all cups have milk in them is an example of overgeneralization.