Which process(es) is/are involved in the turning of starch iodide paper blue-black by chlorine gas?

A. chlorine attacks the starch to give the blue-black color
B. chlorine attacks the iodide ion to give the blue-black color
C. chlorine oxidizes the iodide ion to produce iodine which attacks the starch to give the blue-black color
D. iodine attacks the starch to give the blue-black color

Correct Answer: Option C

C. chlorine oxidizes the iodide ion to produce iodine which attacks the starch to give the blue-black color