Menu is related to Choose. Choose is related to Decision. Decision is a synonym of Conclusion. Conclusion is a type of Assumption. 
Challenge is related to Difficult. Difficult is etymologically related to Difficulty. Killer is a type of Difficulty. 
Menu <--RelatedTo--> Choose <--RelatedTo--> Decision <--Synonym--> Conclusion --IsA--> Assumption 
Challenge <--RelatedTo--> Difficult --EtymologicallyRelatedTo--> Difficulty <--IsA-- Killer 