He saw no such thing anywhere, which seemed remarkable, Save, hard by in the open, a hillock of sorts, A smooth-surfaced barrow on a slope beside a stream Which flowed forth fast there in its course, Foaming and frothing as if feverishly boiling. This is a description of
a. The fen
b. The host's castle on Christmas Eve
c. The Green Chapel
d. The grave of Beowulf