Tooth
Singular Possessive: Tooth's
Plural Possessive: Teeths'
Puppy
Singular Possessive: Puppy's
Plural Possessive: Puppys'
The correct answer is A.
The passage shows that Armand is considerate. He looks after his brother (even if it means sometimes "issuing rules and regulations") and he thinks it would be good to get their father a present for his birthday.
For these reasons, this passage best shows Armand is considerate.
The correct answer is B) going is a present participle.
A would be - went.
C would be - go/goes.
D would be - gone.