Money is related to Royal. Royal is related to Guard. Guard is related to Agent. 
Option is related to Reply. Reply is the opposite of Answer. Answer is related to Learning. Puzzle can be used for Learning. 
Money <--RelatedTo--> Royal <--RelatedTo--> Guard <--RelatedTo--> Agent 
Option <--RelatedTo--> Reply <--Antonym--> Answer <--RelatedTo--> Learning <--UsedFor-- Puzzle 