Which of the following sentences is punctuated correctly?
AI would like to go to the movies; but Mary doesn't want to go.
BI would like to go to the movies; Mary doesn't want to go.
CI would like to go to the movies; but, Mary doesn't want to go.
AI would like to go to the movies; but Mary doesn't want to go.
BI would like to go to the movies; Mary doesn't want to go.
CI would like to go to the movies; but, Mary doesn't want to go.