Which

one of these did not cause a major stock market crash?

a) Enthusiasm

among investors when excessive number of internet companies came to market

b) Panic

caused by 9/11 terrorist attacks to World Trade Centre

c) Extreme

worries among market traders when Donald Trump was elected as the U.S.

President first time

d)

Excitement among investors due to subprime mortgages that made it easier to buy

houses