In 1952, Scientists Francis Crick and James Watson Made Which

In 1952, scientists Francis Crick and James Watson made which of the following discoveries?

A) The Salk vaccine against polio, leading to the first mass immunization program against the dreaded virus
B) Penicillin, which helped to launch the boom in the use of antibiotics to treat everything from syphilis to streptococcal infections
C) The configuration of DNA, thus vastly expanding our knowledge of biological inheritance
D) The fire-retardant properties of asbestos, thus leading to an explosion in the material's use by the construction industry, much to the dismay of health experts later