Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

A bond market in which a communications network matches buy and sell orders initiated from various locations is best described as an:
Option A:organized exchange.
Option B:open market operation.
Option C:over-the-counter market.

Answer: C