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What does the following code output?

What does the following code output?

Java

public static int do$\_$things$($int x$)\{$

return x$+=10$;

$\}$

public static void main$($String$[]$ args$)\{$

int a$=5$;

int b$=$do$\_$things$($a$)$;

int c$=$a$+$b;

System.out.println$("$C is $"+$c$)$;

$\}$

C#

public static int do$\_$things$($int x$)\{$

return x$+=10$;

$\}$

public static void Main $($string$[]$ args$)\{$

int a$=5$;

int b$=$do$\_$things$($a$)$;

int c$=$a$+$b;

Console.WriteLine$("$C is $"+$c$)$;

$\}$

Question $3$ options:

C is $10$

C is $15$

C is $5$

C is $20$