Final answer:
Chlorine (Cl) and bromine (Br) are both elements found in Group 17 of the periodic table, known as the halogens.
Step-by-step explanation:
Chlorine (Cl) and bromine (Br) are both elements found in Group 17 of the periodic table, known as the halogens. The halogens are highly reactive nonmetals that readily form compounds with metals. Chlorine is a pale yellow-green gas, while bromine is a deep orange liquid.
Based on this information, the correct answer is A. Both chlorine and bromine are halogens.