Which row gives the characteristics of a transition element?
- Amelting point $-210\,^\circ\text{C}$; low density at r.t.p.; brown gas oxide at r.t.p.
- Bmelting point $113\,^\circ\text{C}$; high density at r.t.p.; white solid oxide at r.t.p.
- Cmelting point $650\,^\circ\text{C}$; low density at r.t.p.; white solid oxide at r.t.p.
- Dmelting point $1085\,^\circ\text{C}$; high density at r.t.p.; red solid oxide at r.t.p.