Which of the following is a redox reaction?

A redox reaction is a chemical process in which electrons are moved between the two reactants.
The redox reactions are,

${\mathrm{C}}_2{\mathrm{H}}_4+3{\mathrm{O}}_2\to 2{\mathrm{CO}}_2+2{\mathrm{H}}_2\mathrm{O}$

$3{\mathrm{SnCl}}_2+6\mathrm{HCl}+2\mathrm{NO}\to 3{\mathrm{SnCl}}_4+2{\mathrm{NH}}_2\mathrm{OH}$

${\mathrm{PCl}}_3+{\mathrm{Cl}}_2\to {\mathrm{PCl}}_5$