Answer :
The newly issued securities sold at C. primary market.
Where are newly issued securities sold?
New securities are been created and sold to investors for the first time using the exchange that is been done in the primary market.
It should be noted that once this done , the investors trade these securities on the secondary market, however the primary market is also known as the new issues market whereas the secondary market is been described as one where stock market or stock exchange.
Hence , newly issued securities sold at C. primary market.
Therefore, option C is a correct.
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