In the Case in the Text,Drake Manufacturing Company,Inc

In the case in the text,Drake Manufacturing Company,Inc.v.Polyflow,Inc. ,why did the court find in favor of the defendant?

A) The plaintiff's actions in Pennsylvania constituted "doing business" and it failed to timely obtain a certificate of authority.
B) Although the plaintiff's actions did not constitute "doing business" its use of the certificate of authority during post-trial proceedings was erroneous.
C) The lower court abused its discretion when it found in favor of the defendant because its activities in the state did not make it liable in that state.
D) The plaintiff was not properly incorporated in any state.