【有哥在】評論
16. (A) zenith 頂點；天頂
【仰】評論
(A) Zenith: The highest point or peak of achievement, development, or prosperity. (B) Trough: A low point or minimum period in the development or fortunes of a particular thing. (C) Deficit: A shortage or deficiency, especially a financial one. (D) Fanfare: A showy, spectacular display, especially one intended to attract attention or acclaim.由於文中提到cobalt市場將在2027陷入困境，且只能依靠開採與回收來滿足需求，故答案選C表示缺乏，即缺乏需求量的cobalt.