Explanation:

The World Press Freedom Index is a report published every year since 2002 by Reporters Sans Frontieres (RSF) or Reporters Without Borders.

• The Index ranks countries and regions according to the level of freedom available to journalists. However it is not an indicator on the quality of Journalism. 
• In the World Press Freedom Index 2021, Norway has topped yet again for the fifth year in the row, followed by Finland and Denmark.
• Eritrea is at the bottom meanwhile China is ranked 177, and is only above North Korea at 179 and Turkmenistan at 178.
• India has ranked 142nd yet again out of 180 nations in the recently unveiled World Press Freedom Index 2021.
• The Constitution, the supreme law of the land, guarantees freedom of speech and expression under Article 19, which deals with ‘Protection of certain rights regarding freedom of speech, etc.
• Freedom of press is not expressly protected by Indian legal system but it is impliedly protected under article 19(1) (a) of the constitution, which states - "All citizens shall have the right to freedom of speech and expression". 

Hence only statements 2&3 are correct.