Reactivity order of halides for dehydrohalogenation is : -

Question

( A ) R – F > R – Cl > R – Br > R – I
( B ) R – I > R – Br > R – Cl > R – F
( C ) R – I > R – Cl > R – Br > R – F
( D ) R – F > R – I > R – Br > R – Cl