HI Dissociates to Form I₂ and H₂: 2 HI(g) $\rightarrow$ H₂(g+I₂(g)

HI dissociates to form I₂ and H₂: 2 HI(g) $\rightarrow$ H₂(g+I₂(g) . If the concentration of HI changes at a rate of -0.45 M/s, what is the rate of appearance of I₂(g) ?

A) 0.90 M/s
B) 0.45 M/s
C) 0.23 M/s
D) 1.0 M/s
E) 0.13 M/s