These are the first two parts of a syllogism; you need to select the answer which is the correct final part of the syllogism:
• The dog only barks at strangers.
• The dog did not bark when Silver Blaze was taken.
A. Ergo, the dog barked when Silver Blaze was taken.
B. Ergo, the dog did not bark when Silver Blaze was taken.
C. Ergo, Silver Blaze was taken by a stranger.
D. Ergo, Silver Blaze was not taken by a stranger.