Which quote is properly formatted?

It will use the following information -

direct quote - I love my monkey

George Hat

page 108

a
The author then stated "I love my monkey," (Hat 108).
b
"I love my monkey," (Hat 108).
c
The author then stated "I love my monkey," (Hat pg 108).
d
The author then stated "I love my monkey." (Hat 108).

b

"I love my monkey," (Hat 108).