Consider the following Java code

public static String repeat$1($char c$,$ int n$)\{$

String answer $=""$;

for $($int j$=0$; j $<$ n; j$++)$

answer $+=$ c;

return answer;

$\}$

As the input size doubles, the running time approximately grows by a factor of:

Question $15$ options:

log$(2)$

$1$

$4$

$2$