Question $11($Mandatory$)(1$ point$)$

Regarding a common market, which of the following is true?

$$ a$)$ It represents a more complete integration of member nations than a customs union.

b$)$ It exercises common external trade restrictions against members.

C$)$ It restricts the movement of factors of production across national borders.

$$ d$)$ It permits the free movement of goods and service among nonmembers.