Answer:
C. noun | a particular look on someone’s face
Explanation:
In order to find the correct definition of the word expression in the context for this sentence, “The parkour was dead and Mildred kept peering in at it with a blank expression as Montag paced the floor and came back and squatted down and read a page as many as ten times, aloud,” you can think of synonyms for the key word, which is in this case the word expression.
If we think about the phrase, “Mildred kept peering in at it with a blank expression,” the best word to substitute expression would be a word like “look;” This phrase is describing the blank look, or expression, on Mildred’s face as Montag read the book. So, the definition that best fits this would be C, a particular look on someone’s face.
