it may be for this reason that the art and copy departments of advertising agencies are known as creative departments and their heads are known as creative directors. that의 용법이 뭔가요?? ㅠㅠ 급해요
그리고 위의 that의 용법을 적용한 문젠데요,

that 와 어법상 같은 쓰임으로 쓰인 것을 고르시오.
① i believe that he is not a liar.
② the rumor that he is ill is not true.
③ you are the only woman that i love
④ it was thirty minutes ago that i came back home from school.
⑤ it is certain that the bicycle is convenient.

답이 4번이래요 왜요??