${\displaystyle \underset{0}{\overset{}{}}}$

$$

$3\mathrm{.}5\%$

$4\%$

b$.$ Okun's law predicts that the percentage change in real GDP from $2008$ to $2009$ should be

$0\%-1\mathrm{.}5\%$

$-4\%-5\%$

c$.$ The actual percentage change in real GDP from $2008$ to $2009$ was

$-4\%-2\mathrm{.}6\%$

$0\%-1\mathrm{.}5\%$