The correct answer is option 3, China. Recently, China has been awarded a malaria-free certification by the World Health Organization (WHO). A malaria-free certification indicates that a country has successfully eliminated malaria within its borders and has put in place effective prevention and control measures to prevent the re-establishment of the disease.

Option 1, Pakistan, is not the correct answer. Pakistan still has a significant burden of malaria cases and has not been awarded a malaria-free certification by the WHO.

Option 2, Bhutan, is also not the correct answer. While Bhutan has made significant progress in reducing malaria cases, it has not yet been certified as malaria-free by the WHO.

Option 4, Nepal, is not the correct answer either. While Nepal has made great strides in reducing malaria cases, it has not yet been certified as malaria-free by the WHO.

Therefore, the correct answer is option 3, China, which has recently been awarded a malaria-free certification by the WHO.