Answer:
The answer is: superficial.
Although there was a slight earthquake, the building suffered only superficial damage.
Explanation:
The sentence suggests that the word missing should describe the type of damage that the building suffered, therefore, we can rule out tactful and inevitable. Surreptitious means that something is done clandestinely, which cannot be used to describe damage caused by an earthquake.
The word that best fits the sentence is superficial, the word only in the sentence indicates that even though there was an earthquake, the damage was not serious.
