The correct answer is: Only argument I is strong.
Argument I is strong because it is based on the evidence that young entrepreneurs are more likely to start new businesses than older entrepreneurs. New businesses are important for economic growth because they create new jobs and products.
Argument II is weak because it is based on the assumption that young entrepreneurs will create jobs for themselves and others. However, there is no guarantee that this will happen. In fact, many new businesses fail, and the entrepreneurs who start them may end up unemployed.
In conclusion, only argument I is strong. Argument II is weak because it is based on an assumption that is not necessarily true.