Answer:
A.Br
Step-by-step explanation:
Bromine is the only gas from the choices provided. It belongs to the group of halogens, group 7.
It has atomic number of 35 and it belongs to the p-block on the periodic table.
- C is carbon and carbon is a solid matter
- B is boron and boron is a metalloid
- Be is beryllium and silvery white metal
Only Bromine is the gas from the given choices. It is fuming liquid and when exposed, it becomes gaseous.