Each chord is a triad or a seventh chord, in root position or an inversion. Name the chord's root, then choose the figured bass that labels its position. Remember that the root is not always the lowest note: find the bass, then stack the chord in thirds to find the root.

Triads: (5/3) for root position, 6 for first inversion, 6/4 for second inversion. Seventh chords: 7 for root position, 6/5 for first inversion, 4/3 for second inversion, 4/2 for third inversion.