Dholavira was in the news recently because it received the UNESCO World Heritage Tag. This means that Dholavira has been recognized by UNESCO as a site of cultural or natural importance that is deserving of international protection and preservation. The tag signifies the significance and value of Dholavira as a historical and archaeological site.

Option 1 suggests that skeletons were discovered at Dholavira, but there is no information in the question or context to support this. Option 2 suggests that Dholavira was in the news for its conservation efforts, but the question specifically asks why it was in the news, not for what reason it should be in the news. Option 3 suggests that gold and precious stones were discovered at Dholavira, which again has no basis in the question or context.

Therefore, the correct answer is option 4, as it aligns with the information provided in the question.