Which of the following is most important in the interpretation of an allusion?

the attention of the reader
the level of meaning
communicating effectively
understanding the reference

Understanding the reference is the most important in the interpretation of an allusion. Allusions rely on the reader's knowledge and understanding of the referenced person, event, or work in order to fully comprehend the intended meaning. Without understanding the reference, the allusion may go unnoticed or be misinterpreted.