Pan is used here as?

Read the stanza and the question

Pan, O great Pan, to thee
Thus do we sing!
Thou who keep’st chaste and free
As the young spring:
Ever be thy honour spake
From that place the more is broke
To the place day doth unyoke

A. an allusion
B. symbol
C. irony
D. metonymy

Correct Answer:

Option B – symbol