HeLa cells used for the study of cell division, are

A HeLa is a human cell line which is immortal in nature. It has the potential to survive longer and divide incessantly. The line was derived from cervical cancer cells taken on February 8, 1951, from Henrietta Lacks, a patient who eventually died of her cancer on October 4, 1951. The cells from Henrietta's tumor were taken by researcher George Gey, who "discovered that [Henrietta's] cells could be kept alive and grow indefinitely. 

So, the correct answer is option B.