Oxidation unit test Please help ASAP

Use the reaction to answer the question
C3Hg + 502 - 3C02 + 4H20 + energy
Which type of reaction is shown?
(1 point)
O decomposition
o displacement
O combination
Ocombustion

(If you have the correct answers for the whole test you will have an amazing week starting now)

when the volume of gas is   changed from   717.73 ml   to 852 ml   the temperature will   change   from 315   c to 452   c

    calculation

this is calculated using the charles law formula

that is,   v1/t1 = v2/t2

          v1=?

        t1 = 315 c   into   kelvin = 315 +273 = 588 k

        v2 = 852   ml

        t2 = 425c + 273 =698 k

make v1   the subject of the formula ( by   multiplying both side by t1)

  v1=( v2 xt1) / t2

v1= (852 ml   x 588 k)/ 698 k= 717.73 ml