Which of the Following Is Approximately True When Size Is

Which of the following is approximately true when size is measured in terms of the underlying principal amounts or value of the underlying assets

A) The exchange-traded market is twice as big as the over-the-counter market.
B) The over-the-counter market is twice as big as the exchange-traded market.
C) The exchange-traded market is ten times as big as the over-the-counter market.
D) The over-the-counter market is ten times as big as the exchange-traded market.