Which reaction occurs most rapidly at standard conditions?

The choices that are attached to this question is:

a) H2(g) + I2(s) 2HI(g) 

b)Cu(s) + S(s) CuS(s) 

c) C6H12O6(s) + 6O2(g) 6CO2(g) + 6H2O(g) 

d) 5C2O42-(aq) + 2MnO4- + 16H+(aq) 10CO2(g) + 2Mn2+(aq) + 2H2O(1) 

e) Ag+(aq) + I- AgI2(s)

Therefore, the answer would be letter e) "Ag+(aq) + I- AgI2(s)" since it mainly involves a precipitate in solid form.

If you make you answer for clear i can answer it : )