The statement discusses the potential devastation caused by economic sanctions on an already weak economy. Let's evaluate the assumptions one by one:
Assumption 1: Economic sanctions impact only a weak economy.
This assumption is not implicit. The statement suggests that economic sanctions would have a significant impact on a weak economy but does not imply that only weak economies are affected. Sanctions can affect economies of varying strengths.
Assumption 2: The impact of economic sanctions varies from economy to economy.
This assumption is implicit. The statement implies that the effect of economic sanctions is contingent upon the current state of the economy, indicating that different economies may experience varying degrees of impact from sanctions.
Therefore, the correct answer is: If only assumption II is implicit.