What are saprophytes?

• Saprotrophs are the kind of organisms that fulfill their nutritional requirement by feeding on dead and decaying organic matter. 
• Saprotrophs can be considered as a category of heterotrophs. 
• Saprotrophs do not possess any chlorophyll.
• They secrete some digestive juices and enzymes that convert the dead and decaying matter into simpler form. 
• They thrive in mild acidic and neutral environments. 
• They cannot grow well in alkaline conditions. 
• Mushrooms are the example of the saprotrophs.

Hence, the correct option is D.