My mother promised, "as long as you complete your homework; you can go to the game."

in order to be punctuated correctly, how must the sentence above be rewritten?
a.
my mother promised, "as long as you complete your homework, you can go to the game."
b.
my mother promised. "as long as you complete your homework you can go to the game."
c.
my mother promised! "as long as you complete your homework. you can go to the game."
d.
this sentence is punctuated correctly and does not need to be rewritten.