The answer is anomalies because deformed is a very strong way of talking about his appearance, and is very rude. Elective and petrified don't make too much sense. Anomalies is a slight way of saying that he won't be normal, but it isn't too rude like deformed.
Explanation: Deformed and petrified are both adjectives. Elective is a noun, but doesn't even make sense in this context. An anomaly is strange or unusual, differing from the norm, just like Auggie's appearance differs from the norm of a "normal" face. Therefore, the answer is anomalies.
