Which of the following corrects the mistake in the example below? It was getting dark in the stadium, and we must switch on the lights.

It was getting dark in the stadium, and we didn’t have to switch on the lights.

It was getting dark in the stadium, and we mustn’t switch on the lights.

It was getting dark in the stadium, and we have to switch on the lights.

It was getting dark in the stadium, and we had to switch on the lights.

It was getting dark in the stadium, and we don’t have to switch on the lights.