Who Doesn't Start In The Middle?

Logic Level 1

You are playing a game of Tic-tac-toe. You are playing as $\color{#3D99F6}O$ while your opponent plays as $\color{#D61F06}X$ . The game plays as shown:

Which of the three labelled boxes should you put your next $\color{#3D99F6}O$ in to save yourself from losing?

Assume your opponent plays optimally, that is your opponent always try to win and always try to save themselves from losing.