Production of seeds, fruit, and flowers are characteristics of which group?

a)mosses
b)ferns
c)angiosperms
d)gymnosperms

The correct answer is- C) Angiosperms.

Angiosperms are also called flowering plants as they produce flowers. They can be described as seed possessing plants where the ovule, present within ovary, is converted into seed and ovary (present within flower) is converted to fruit after fertilization. Fruits are developed from the maturation of floral organs of these plants.  

Thus, C) is the right answer.