Read this excerpt from Rupert Brooke’s "The Soldier." What does the word dust refer to?

If I should die, think only this of me:
That there's some corner of a foreign field
That is for ever England. There shall be
In that rich earth a richer dust concealed;
A dust whom England bore, shaped, made aware,
Gave, once, her flowers to love, her ways to roam,
A body of England's, breathing English air,
Washed by the rivers, blest by suns of home.

A.
buried treasure
B.
the speaker's body
C.
fertile soil
D.
deceased foreigners
E.
dreams and wishes