Option 1 (Encouraged) -> Directly means to promote or support development, which aligns perfectly with "fostered."
Option 2 (Persisted) -> Means to continue firmly despite difficulties, which is unrelated to the meaning of "fostered."
Option 3 (Leveraged) -> Means to use resources to maximum advantage, which in context can relate to promoting growth like "fostered."
Option 4 (Expanded) -> Means to make larger or more extensive, which doesn't capture the nurturing sense of "fostered."
Hence, Option 1 (Encouraged) and Option 3 (Leveraged) -> "Fostered" in the passage refers to promoting and developing (a unified market and innovation). While "encouraged" is the most direct synonym meaning to support development, "leveraged" can also apply in the business/economic context where fostering growth involves strategically utilizing resources and advantages to promote development -> correct