The narrow were too narrow by far so I skipped the C width to go with the extra wide.  Fine in the toe, but too big around the instep area.  Also a little too long.  I should have ordered a smaller size also.  But I had already returned 2 pair of sandals and decided to keep them.  By adjusting the Velcro straps I can make all the extra length be in the heel which is not too bothersome.