TOEFL Listening: TPO-TOEFL阅读TPO - PZZBFC40R144GOJ3N$

According to paragraph 2, why did Mendeleyev suggest changing the atomic mass of indium? A. Because indium did not fit into the periodic table in the place predicted by its atomic mass B. Because there was experimental evidence that the atomic mass that had been assigned to indium was incorrect C. Because there was an empty space between cadmium and tin in the periodic table D. Because the chemical properties of indium were similar to those of arsenic and selenium