Identify the sentence that is punctuated correctly.

A. Researchers know little about the distinctive market behavior of that group.
B. Website programming systems have existed for some time but, they originally were difficult to use
C. In connection with the tax cut, we are presently studying the time lags between significant financial charges, and their impact on spending decisions.
D. According to the weather channel forecasts for snow are inevitable.

It's neither B nor C