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Name the missing classes....a question

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Refer to the exhibits to answer the question. What are the names of missing classes XXX and YYY in exhibit below ? (choose one)

a)XXX = DeliverySchedule, YYY = Supplier
b)XXX = Supplier, YYY = DeliverySchedule
c)XXX = PreferredSupplier, YYY = DeliverySchedule
d) XXX = DeliverySchedule, XXX = PreferredSupplier
YYY should be DeliverySchedule.
XXX should be either Supplier or PreferedSupplier. But, since it is generalization and not Interface and since Supplier is not abstract, I chose (b) to be the correct answer.
Please comment.
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(c) is incorrect, since PreferredSupplier class is a specialization of Supplier, it cannot be XXX.
(d) is also incorrect since there is no YYY option and even if we assume that the second portion of the answer is YYY, it is wrong, since DeliverySchedule is YYY.
(a) is incorrect, since DeliverySchedule is related to Supplier thru Composition and Supplier is related to InventoryProduct thru association
and following Sequence diagram, XXX should be Supplier & YYY should be DeliverySchedule.
In my opinion, (b) is the correct answer.
Please comment, if you think the answer/reasoning is different.
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