Final answer:
When a yellow flower is introduced into a gas containing chlorine, the flower will not be affected.
Step-by-step explanation:
When a yellow flower is introduced into a gas containing chlorine, the flower will not be affected (choice D). Chlorine gas does not directly react with the flower and does not cause any visible changes in its color or structure. However, it is important to note that exposure to chlorine gas can be harmful to living organisms, including flowers, as it is toxic and can cause respiratory damage.