Which of the following events was prompted by ida tarbell's investigative journalism?
a.
congress passed a pure food and drug act.
b.
the supreme court broke up the standard oil trust.
c.
roosevelt invited tarbell to dinner at the white house.
d.
child labor laws were rewritten

In a study, people were asked to imagine simple occasions that made them happy and to remember events that made them feel proud about themselves. it was observed that the subjects developed an increasingly positive attitude. these changes are known to be healthy, leading to greater physical activity and reducing unhealthy habits. based on this excerpt, we can conclude that a positive attitude .