Which of the following is a symbol of the dwarves' heritage in The Hobbit?

The Hobbit by J.R.R. Tolkien.

Which of the following is a symbol of the dwarves' heritage?

A.) The map of Thrain.
B.) The valley of Dale.
C.) The Arkenstone.
D.) The black arrow.

????

Thanks.
Update: No guesses, please -___-
5 answers 5