Bill has been working in advertising for a long time, handling ad buys for various clients. He has gotten used to Facebook's ad manager, which he used to see as a threat to his job, but now sees as a source of valuable information.

The latest ad he posted for the LA Auto Show had close to $1,000$ impressions and $253$ people who clicked through to the Auto Show's site. Bill reports to the LA Auto Show that the click$-$through rate on this ad is close to:

a$.$

$0\mathrm{.}25.$

b$.$

$2\mathrm{.}53.$

c$.$

$253.$

d$.$

$4.$