Below are bid$-$ask data on the German stock index $($in local currency$),$ as well as the $$/$ exchange rates for $1/31/2007$ and $1/31/2008$

$1/31/2007$

$1/31/2008$

German Stock Index

$($Bid $-$ Ask$)$

$($Bid $-$ Ask$)$

$350-360$

$300-310$

Exchange Rate

$1\mathrm{.}281\mathrm{.}29$ $$/$

$1\mathrm{.}481\mathrm{.}49$ $$/$

Natalie Kay, a dollar$-$based investor living in Pennsylvania, purchased shares in the German Stock Index on $1/31/2007$ and sold them on $1/31/2008$ What was Natalie's return on this investment during the year?

a$.4\mathrm{.}59\%$

b$.-1\mathrm{.}66\%$

C$.-4\mathrm{.}39\%$

d$.$ None of the above.