According to Marx, recessions or "crisis of overproduction" come from:

Group of answer choices:

a) there is a shortage of profitable investments as compared to the large profits generated by giant corporations, leading to less investment spending.

b) conservative economic policies based on Say's Law have restricted the use of fiscal policies that could stimulate the economy

c) workers cannot afford to buy all that they make because of exploitation while businesses can produce more and more by reinvesting their profit

d) there is not enough money to finance investment because the Federal Reserve is following a monetarist policy and is too afraid of inflation.