Answer:
D. subside
Step-by-step explanation:
Weakened is a word that means that something has less strength or power. From all the options, the most suitable was subside, where the two definitions of the word meant losing intensity or go a level down.
The other options are incorrect since havoc means destruction, meader means zigzag and pristine means in perfect condition. None of these words have a similar meaning to weakened.
We can see with the passage that the word "subside" meant that her anger moved down to a lower level due to the cuteness of the puppy.