The correct option is B Enders
Virus lacks metabolism of its own and due to this reason they cannot multiply without infecting a living cell. Due to this reason viruses could not be cultured in a laboratory. In 1941 John Enders, Frederick Robbins and Thomas Weller succeeded in culturing the virus that causes polio in human muscle and tissue in a laboratory setting. This became a key step for making vaccine against polio. So, the correct answer is 'Enders'.