WHICH ONE OF THE STATEMENTS DOESN’T REFER TO SMALLPOX

54- - DE THI THU DAI HOC MON ANH VA DAP AN
Tiếng Anh DE THI THU DAI HOC MON ANH VA DAP AN
54- Which one of the statements doesn’t refer to smallpox?A- Previous project had failed. B- People are no longer vaccinated for it.C- The WHO set up a worldwide campaign to eradicate the disease. D- It was a fatal threat.