Four mystery polyps !

Just a bit of fun!   Above are four types of benign polyps which can be found in the stomach, duodenum and colon respectively. I've used a 'plugin' which will hopefully make it easier to see the polyps on a small screen. 
BUT WHAT ARE THESE FOUR POLYPS ? 
A = 
B = 
C = 
D = 

You'll have to make up your mind and then click 'Explanation' below to reveal the correct answers ! 

EXPLANATION

The 3 polyps in column A are all adenomatous polyps.  Flat and plaque-like in the stomach,  pale in the duodenum and a sessile TVA in the colon. 

Column B shows NET's with the prominent vessels along it's side in the stomach and colon whilst the duodenal NET has the typical central depression.

Column C shows 'hamartomatous' polyps seen in Peutz-Jeghers syndrome. There is hardly ever any dysplasia within these polyp and it's uncertain what the 'precursor lesion' is for these patients GI cancers

Column D show inflammatory polyps which are typically angry red and sometimes with pretty white spots !