When you find something that interests you, how do you make a hypothesis

What does the fall of the bastille represent? ?

One drawback of voluntary trade is that it a.requires two groups to use a common language b.can make one group dependent upon another for necessary goods c.doesn't occur unless there is a shortage of goods for at least one group d.forces groups to rely on themselves to produce all the goods they need

Based on this passage, which issue facing laborers did samuel gompers want to focus on first?