Which sentence from this excerpt states the central claim of the text?
a) however, the most successful way of combating smallpox before the discovery of vaccination was inoculation.
b) the word is derived from the latin inoculare, meaning "to graft." inoculation referred to the subcutaneous instillation of smallpox virus into nonimmune individuals.
c) the inoculator usually used a lancet wet with fresh matter taken from a ripe pustule of some person who suffered from smallpox.