Which is the best way to rewrite sentences 23 and 24?
(23) I did not see it then. (24) I was overtraining.
A. I did not see it then; for I was overtraining.
B. I did not see it then, and I was overtraining.
C. I did not see it then, but I was overtraining.
D. I did not see it then I was overtraining.