[单选题]
The elements in the z -:*rb g4 jovt4/xp rd wy93-rfccep3periodic table which lac9 l3yy9vswc4 wq) gbf.k one electron from a filled shell arwygv4qyf 9) l9cws3b. e referred to as
A. noble gases.
B. halogens.
C. alkali metals.
D. transition elements.
