Adding an independent variable to a regression model will always reduce the coefficient of determination

The table above shows the production possibilities for an economy. The opportunity cost of a loaf of bread is ________ when moving from possibility B to possibility C

A) 1/2 of a book B) 2 books C) 200 books D) 100 loaves of bread E) 1 loaf of bread

Which Latin American country defaulted on loans in 2005 and paid off their creditors at only 1/3 value?

A) Argentina B) Brazil C) Chile D) Colombia E) Mexico