Where does the semi-colon go?

In the question the correct answer is A however I do not understand wheather to chose answer A or C. Where does the semi-colon go and why?

https://preview.redd.it/4vox099g7z4e1.png?width=1070&format=png&auto=webp&s=51b3d4b669331fdae3c5eb49898701e8e95e7010