Final answer:
The allusion to Eurydice in Robert Frost's poem has a multifaceted effect; it suggests that climbing a tree is akin to an otherworldly journey, adds an element of being rescued, and enriches the narrative with mythological and historical dimensions. The correct answer is option 3.
Step-by-step explanation:
The effect of the allusion to Eurydice in the poem by Robert Frost is an example of how literary devices can add depth and layers of meaning to poetry. Alluding to Eurydice, who was brought back from the underworld in Greek mythology, suggests a deep adventurism in mundane tasks, like climbing a tree to gather grapes. It could symbolize an escape or a journey to an otherworldly realm that the speaker experiences, emphasizing the transformative nature of such simple acts. It may also imply a sense of being rescued or returning from a point of no return, as Eurydice was in the myth. This allusion adds a historical and mythical dimension to the speaker's experience, enriching the narrative with imagination and a connection to the past.