The answer of this questions is D
A and b I believe are correct
The first is the power<span> to tax and to spend the money raised by taxes, to provide for the nation's defense and general welfare. This section was supplemented by the 16th amendment, which permitted </span>Congress<span> to levy an income tax.</span>
Answer:
Stock market speculation
Explanation:
the stock market crash itself did not cause the Great Depression that followed.