In the Book of Revelation, the 'bottomless pit' (Revelation 9:1) is opened, and locusts emerge. What is the primary purpose of these locusts, according to the text?

A To destroy all vegetation and food sources, causing widespread famine. B To wage war against the saints and conquer them. C To torment those who do not have the seal of God on their foreheads. D To herald the coming of the Antichrist and prepare the way for his reign.