Enthalpy of neutralisation of all strong acids and strong bases has the same value because

Question

(a) neutralisation leads to the formation of a salt and water
(b) strong acids and bases are ionic substances
(c) acids always give rise to $H^+$ ions and bases always furnish $OH^-$ ions
(d) the net chemical change involve the combination of 1 mol of $H^+$ ions and $OH^-$ ions to form water.