Which of the following is a run-on
sentence?

A. There was no evidence to support his case; however,
there was a lot of suspicion.

B. There was no evidence to support his case, but there was
a lot of suspicion.

C. There was no evidence to support his case. There was
certainly a lot of suspicion.

D. There was no evidence to support his case however
there was a lot of suspicion.