For the reaction,

$2{\mathrm{C}}_2{\mathrm{H}}_6\left(\mathrm{g}\right)+7{\mathrm{O}}_2\left(\mathrm{g}\right)⟶4{\mathrm{CO}}_2\left(\mathrm{g}\right)+6{\mathrm{H}}_2\mathrm{O}\left(l\right)$

the rate of disappearance of ${\mathrm{C}}_2{\mathrm{H}}_6\left(\mathrm{g}\right):$

equals the rate of disappearance of ${\mathrm{O}}_2\left(g\right)$.

is seven times the rate of disappearance of ${\mathrm{O}}_2\left(g\right)$

is one-third the rate of appearance of ${\mathrm{H}}_2\mathrm{O}\left(l\right)$

is twice the rate of appearance of ${\mathrm{CO}}_2\left(g\right)$