Which of these are demerits of Mendeleev's periodic table?

Options :
  1. Isotopes were not given seperate places
  2. Positions of some elements was not justified
  3. Lanthanides and actinides were not included in the table
  4. all of these


Answer and Explanation :-

Answer: Option 4

Explanation:

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Two types of choices seem to me to have been crucial in tipping the outcomes [of the various societies' histories] towards success or failure: long-term planning and willingness to reconsider core values. On reflection we can also recognize the crucial role of these same two choices for the outcomes of our individual lives.
-Jared Diamond Collapse: How Societies Choose to Fail or Succeed