Answer:
B. Bought the bonds from Dalrymple and sold them to the public
Explanation:
As the Investment Bankers for the event, The Commonwealth Bank of Australia were underwriters to the issue.
One of the methods of Underwriting that Investment bankers embark on is called the FIRM COMMITMENT Principle which states that the Investment bank will.buy all the bonds or shares and then resell them. If they are unable to resell them however, the remaining bonds or stock is their problem.