In the following sentence, identify the grammatical function of the word "that" ...

Questão de Inglês da banca AMEOSC aplicada no concurso Prefeitura de Anchieta SC (2024). Confira a resolução completa abaixo:

In the following sentence, identify the grammatical function of the word "that" and choose the option that best explains its role: "It was the kind of movie that left the audience speechless."