What is the meter in this stanza from Robert Frost’s “Stopping by Woods on a Snowy Evening”?

Whose woods these are I think I know.
His house is in the village though;
He will not see me stopping here
To watch his woods fill up with snow.

A.
iambic pentameter
B.
iambic tetrameter
C.
iambic trimeter
D.
iambic hexameter