Which of the following sentence is written correctly
A. add a little butter to the pan (you can use olive oil as a substitute, if you like
B . add a little butter to the pan {you can use olive oil as a substitute, if you like }
C . add a little butter to the pan--you can use olive oil as a substitute, if you like
D . add a little butter to the pan, you can use olive oil as a substitute, if you like