Answer:
(c) chagrined
Step-by-step explanation:
The blank should be filled with a word that qualifies or describes the dog. In other words, the blank should be filled with an adjective.
In the options provided, the words that are actual adjectives are;
i. pernicious which means harmful, deadly or wicked.
ii. chagrined which means irritated, troubled or unsettled.
Even though both words could fit well into the blank, the one that fits better and fairer is chagrined. The dog was unsettled because it was looking for something new.