Answer:
A. He grows more cheerful because of his resolve.
Step-by-step explanation:
According to the book "The Cloak", Akaky is described as unassuming, quiet and just unremarkable but after getting his new coat, he changed completely and became more full of life, smiles, and even occasional bursts of anger.
Akaky loves his coat which is already threadbare and worn out but when he decides to cut his expenses to afford his new coat, he grows more cheerful because of his resolve.