Which answer is a correctly punctuated compound sentence?


A.

Technology changes quickly and what is up-to-date today is old-fashioned next month.


B.

Technology changes quickly what is up-to-date today is old-fashioned next month.


C.

Technology changes quickly, what is up-to-date today is old-fashioned next month.


D.

Technology changes quickly; what is up-to-date today is old-fashioned next month.