In Joel 2, a plague of locusts is described, followed by a promise of restoration. What is the primary symbolic meaning of the locust plague in the context of Joel's prophecy?

A It symbolizes a literal insect infestation with no deeper spiritual significance. B It represents God's judgment upon sin and a call to repentance, highlighting the consequences of disobedience and the need for a return to God. C It foreshadows the invention of modern pesticides. D It solely represents a future economic crisis that will affect agriculture.