Consider an endothermic reaction $X \to Y$ with the activation energies $E_b$ and $E_f$ for the backwarrd and forward reactions respectively. In general :

Question

( A ) $E_b = E_f$
( B ) there is no definite relation between $E_b$ and $E_f$
( C ) $E_b < E_f$
( D ) $E_b > E_f$