Answer:
Errors.
Explanation:
Angelika should focus on fixing the errors so that her ads can be shown. Because of the errors the code will not compile fully either be it run time error or compile time error or syntax error or any other error.
Warnings shows the potential problems but the code will run even if there are warnings and the notifications are not to worry about.
Answer to this answer is B because
The sound proof room has no sound at all, and an acoustically treated room has small sounds.