The biggest economic advancement that U.S. and South Korea have attempted - a free trade agreement signed in April 2007 - hasn't been completed because it awaits ratification by its respective lawmakers.
a) it , its
b) they, their
c) it , their
d) they, its
Please explain your answers.
a) it , its
b) they, their
c) it , their
d) they, its
Please explain your answers.












