Final answer:
In Seamus Heaney's poem 'Digging', the poet compares his pen to a spade and his act of writing to digging, reflecting his admiration for his ancestors' labor and his own craft as a writer.
Step-by-step explanation:
In Seamus Heaney's poem Digging, the poet compares his pen to a spade and, by extension, the act of writing to the act of digging. Heaney uses this metaphor to draw a connection between the manual labor of his ancestors and his own work as a writer.
The correct answer to what two things Heaney compares his pen to in Digging is not a sword and a plow, a hammer and an anvil, or a quill and parchment, but rather c) A spade and a gun.
This comparison reflects Heaney's respect for his father's and grandfather's hard, physical labor, juxtaposed with his own labor of writing. While the quote provided does not directly relate to Heaney's poem, it does evoke similar themes of labor, craftsmanship, and the connection to the land.