Answer
$H.$
Work Step by Step
Starting with the graph of figure 21, taking a=3, $f(x)=3^{x}$,
and then
reflecting across the x-axis ... $y=-f(x)$,
and then
raising up one unit, ... $y=-f(x)+1,$
we obtain this graph.
We look for $ y=1-3^{x}\qquad$... choice $H.$