Which Sentence Is Punctuated Correctly

Multiple Choice

Which sentence is punctuated correctly?

A) Medical innovations have led to increased medical costs, however; the massive expansion of medical insurance has also increased these costs.
B) Medical innovations have led to increased medical costs; however, the massive expansion of medical insurance has also increased these costs.
C) Medical innovations have led to increased medical costs; however the massive expansion of medical insurance has also increased these costs.