Fish are a source of vitamin D; for vitamin A you need carrots, apricots, cantaloupe, or other orange or yellow colored fruits and vegetables.
Fish are not normally a source of vitamin C, since it is destroyed by cooking, but if you eat raw fish, they do contain vitamin C, and that was the source which sustained the Inuit.
Fish
Carrots are a very good source of vitamin A!
Carotene is a good source of vitamin A, according to Switched-On-Schoolhouse (which a homeschooling disk I use).
Vitiman A is good for you
Vitamin C.
Milk is a good source of vitamin D.
Vitamin D is found in oily fish like herring and sardines
Fish is the only natual source of Vitamin D. So yes.......
No.
The sun
Oranges are a good source of vitamin C.