Answer:
b. did not initially cover all categories of workers.
Explanation:
The American Social Security System was very different from what we know today, in its early years of establishment, during the New Deal. The main difference was that it did not cover all professional categories (which made it different from the European pension system). Professional categories were included in this system as the US economic condition strengthened through other New Deal reforms. This happened little by little, until it became what we know today.
Dowager Empress Cixi was very fond of the Boxer Rebellion because she saw this as a chance for them to push the foreigners away. However it cause foreign attacks on Chinese forts.
Dana (30) most likely due to people becoming more stable in "Mid-Life," A range from around 25-45. It starts to become unstable around 50, so my guess would be Dana (30)