Can I say,
(a) The dragon fruit is rich of / with / for vitamin C.
(b) The dragon fruits have rich of Vitamin C.
(c) The dragon fruit has rich of vitamin C.
(a) The dragon fruit is rich in vitamin C.
(b) The dragon fruits have lots of Vitamin C.
(c) The dragon fruit has a rich content/rich reserves of vitamin C.
(a) The dragon fruit is rich and has vitamin C in it.
(b) The dragon fruit has rich in vitamin C.