Answer:
D. Assigning property rights to individuals
Step-by-step explanation:
Tragedy of Commons refers to over exploitation of Common Pool resources : which are Non Excludable (can't be feasibly prevented to be consumed by non paying consumers) , Rivalrous (its consumption reduces its availability to be consumed by other consumers) . Eg : Grazing Land , Fishing Pond
It can be reduced by : Government Intervention or Private Property Rights . Government intervention (not Subsidy) can be rather about legislation & laws , regulatory mechanisms about monitoring the usage of such resources. Private ownership can solve this by adding the element of excludability element to such resources , channelising its utilisation only for efficient purposes , not for wastage .