[单选题]
The elements in the periodic table which have a single outermvzkpn:h div5r7 ,v ), s electron )m dp) 3wlc brm3 *aptac7xfry 3wt/,7are referredfw3 c 7 t/)d,pr m7xwart3*)cab 3pyml to as
A. noble gases.
B. halogens.
C. alkali metals.
D. transition elements.
