Choose the sentence which has the closest meaning to the original one.

It was not until plastic waste became a global issue that people started changing their habits.

Đáp án chính xác: People began to change their habits only when plastic waste turned into a global issue.

Học sinh quan sát hình ảnh/ngữ cảnh và chọn đáp án đúng: People began to change their habits only when plastic waste turned into a global issue..