OPTION B
T>Δt>tp
Race condition is nothing but toggling of values...this toggling cannot be used if it toggles more in the clock period... i.e it occurs when the time period of the clock pulse is greater than the propagation delay of the flip flop so answer will be
T>Δt>tp conditions must be met to avoid race around problem.
where T=the time period of the clock pulse is greater
tp= propagation delay of the flip flop