WHAT DOES THE WORD ‘THEIR’ IN PARAGRAPH 5 REFERS

câu 17: - Đề thi thử THPT 2020 môn Tiếng Anh trường THPT Nguyễn Trung Thiên – Hà Tĩnh
Tiếng Anh Đề thi thử THPT 2020 môn Tiếng Anh trường THPT Nguyễn Trung Thiên – Hà Tĩnh

Câu 17: What does the word ‘their’ in paragraph 5 refers?

A. steps B. sufferers C. techniques D. neuropsychiatrists

Mark the letter A, B, C or D on your answer sheet to indicate the sentence that is closest in meaning to

each of the following questions.