Which bolded phrase features a grim tone in this excerpt from "In Flanders Fields" by John McCrae?

Take up our quarrel with the foe!
To you from failing hands we throw
The torch; be yours to hold it high!
If ye break faith with us who die
We shall not sleep, though poppies grow
In Flanders fields.

Group of answer choices:

In Flanders fields.

If ye break faith with us who die