Refer to the Diagram, Where $S _ { d }$ And $D _ { d }$

Refer to the diagram, where $S _ { d }$ and
$D _ { d }$ are the domestic supply and demand for a product and
$P _ { c }$ is
The world price of that product. If the economy is opened to free trade, the price and quantity sold of
This product would be

A) $P _ { c } \text { and v}$
B) $P _ { a } \text { and } z$
C) $P _ { t } \text { and } y \text {. }$
D) $P _ { C } \text { and } z$