[单选题]
The elements in the periodic table which hav0 w/1 9iqtdek-8ed lbblhj( 3ce a single oute zab5wo9wu;g 4im+.,74 owusjqw )joar s electron are referred to a.z) w ouw5wjo 4;u9 bmso jg4awqa7,i+s
A. noble gases.
B. halogens.
C. alkali metals.
D. transition elements.
