B$.$

k $=1$;

do $\{$

j $=1$;

do $\{$

$//$ code block that takes a constant amount of runtime

j $=$ j $*3$;

$\}$ until $($j $>=0\mathrm{.}5*$n$)$; $//$ if j $<0\mathrm{.}5*$n$,$ continue the loop

k $=$ k $+1$;

$\}$ until $($k $>=$ n$)$;