Whichever Picture you upload FIRST into the article is going to be the one that becomes your "preview" image. So if you want "PictureB" to be the one to appear, you'll have to upload that first. It doesn't matter WHERE the photo appears in the article, just which one that was uploaded First.
I've literally had to delete 20 instructional photos from a page and re-upload them 1 by 1 in the order I want them to appear in order to have the preview image work properly.
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