you would Contemplate because Answer. Contemplate is related to Consider. Consider is related to Idea. 
Basement is related to Garden. you are likely to find Dirt in/at/on Garden. Dirt is related to Lot. 
Answer <--MotivatedByGoal-- Contemplate <--RelatedTo--> Consider <--RelatedTo--> Idea 
Basement <--RelatedTo--> Garden <--AtLocation-- Dirt <--RelatedTo--> Lot 