In the following passage, some of the words have been left out. Read the passage carefully and select the correct answer for the given blank out of the four alternatives._x005F_x000D_ The woodpeckers of the West (with one exception) are different _______________ those of the East, and so are the flycatchers, the grosbeaks, the orioles, the tanagers, the humming-birds, _____________ many of the sparrows. ____________ of the purple and bronzed grackles (the latter are _______________ seen on the plains of Colorado, but are not common), the Rockies boast of Brewer's blackbird, ______________ habits are not as prosaic as his name would indicate._x005F_x000D_ the humming-birds, _____________ many of the sparrows.

• A. and
• B. because
• C. but
• D. if