Correct. Mary Todd Lincoln is in Image B, but not Image A. In Image B Tad is not wearing a watch chain on his jacket, but he is in Image A. In Lincoln’s time, people would carry their watches in a pocket and attach them to their clothing with a chain. If you look closely at Images A and B, you can see that Abraham Lincoln also has a watch chain, which is attached to his vest. In Image A, you can see Tad’s right arm, while in Image B it is not visible.
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