On Thursday, 16 May 2019 at 16:45:19 UTC, Ola Fosheim Grøstad wrote:
> However, Google Search formally does support the display of logos for organizations as structured data (schema.org).

Or to be more precise, you can provide a hint of what the logo ought to be. E.g. the Apple logo is picked up from structured data from a random page.

But it seems that this could be open to abuse (e.g. someone replacing it with something offensive), so I assume it might only have a relevancy weight associated with it and that Google then picks  representative images from other sites (making it difficult to change the image for "political purposes").

Hence, your best bet is to get high ranking webpages that mention D to use the logo (as well as adding structured data).