According to Rolls Royce book The Jet Engine:-
High-energy ignition is used for starting all jet engines.
It then goes on to state that a high value output (12 joules) is required for relight at high altitudes. However, on contaminated runways as it may be necessary to have continuous ignition for automatic relight then a low value (3-6 joules) is better as it gives longer life to the ignition plugs/unit.
So I should say that B is the correct answer.