Which equation describes the relationship between the rates at which Cl2 and F2 are consumed in the following reaction?

Question

Cl2(g) + 3F2(g) yield 2ClF3(g)

a)-d(Cl2)/dt = -d(F2)/dt

b)-d(Cl2)/dt = 2[-d(F2)/dt]

c)3[-d(Cl2)/dt] = -d(F2)/dt

d)2[-d(Cl2)/dt] = -d(F2)/dt

e)-d(Cl2)/dt = 3[-d(F2)/dt]
is it e

Answer 1

Isn't the rate
-d(Cl2)/dt and -(1/3)d(F2)/dt?
If that is so, then
-d(Cl2)/dt = -(1/3)d(F2)/dt and that look like which one