read the passage. The spirit vanished from his eyes as if snuffed." Which best explains how the use of the underlined term adds to the meaning of the passage?

According to this passage, the underlined term shows how quickly and violently death occurs in nature. The correct option is the third one.
The author's intention is to transmit the idea of a sudden event; by reading the word snuffed, the reader understands that the spirit disappeared suddenly, from one minute to the other, unexpected.