Questions

The relationship between two organisms such that one lives on the other and one gets benefited while the other get infected.

A man with colour blindness will see red and green as same. 

The trick here is to follow the structure of the statement. The blank is followed by 'of' and thus the blank will take a filler that can be followed grammatically by 'of' and also manages to give a proper meaning. On the basis of these filters, none of the options except option 2 makes any sense.

The United States subprime mortgage crisis was a nationwide financial crisis, occurring between 2007 and 2010, that contributed to the U.S. recession of December 2007 –June 2009.It was triggered by a large decline in home prices after the collapse of a housing bubble, leading to mortgage delinquencies and foreclosures and the devaluation of housing-related securities.

John Shepherd-Barron was the inventor of ATM (automated teller machine), which was opened on 27th June, 1967 by Barclays bank.