TOEFL Listening: TPO-TOEFL阅读TPO - 3F273EIQ8225E936N$

According to paragraph 2, which of the following symptoms occurs in phosphorus-deficient plants but not in plants deficient in nitrogen or iron? A. Chlorosis on leaves B. Change in leaf pigmentation to a dark shade of green C. Short, stunted appearance of stems D. Reddish pigmentation on the leaves or stem