= Solution
A payoff allocation is <Pareto efficient> if no feasible allocation weakly increases every player's payoff and strictly increases at least one. Here feasibility requires total payment at most the available estate. The proposed payments have
$$
\frac83+\frac{14}3+\frac{23}3=15.
$$
Any such improvement would have total payment greater than $15$, which is impossible. Each payment is also between zero and its claim, and exceeds its singleton <coalition> value. Hence the allocation is an <imputation> and
$$
\boxed{\text{The allocation is Pareto optimal: (a) is true.}}
$$
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