Complete and balance each combustion reaction equation.
$${a}.\mathrm{S}(s)+\mathrm{O}_{2}(g) \longrightarrow \quad \text { b. } \mathrm{C}_{3} \mathrm{H}_{6}(g)+\mathrm{O}_{2}(g) \longrightarrow$$
$$
{c}. \mathrm{Ca}(s)+\mathrm{O}_{2}(g) \longrightarrow \quad \text { d. } \mathrm{C}_{5} \mathrm{H}_{12} \mathrm{S}(l)+\mathrm{O}_{2}(g) \longrightarrow
$$