The correct answer is option 'C' - Bryophyta and pteridophyta.

Explanation:
Zoodiogama is a term that refers to a type of sexual reproduction in plants. It is a combination of two Greek words - 'zoo' meaning animals, and 'gamia' meaning marriage. In this type of reproduction, the male gametes (sperm) are motile and are carried to the female gametes (eggs) by animals.

The options given in the question are:
a) Gymnosperms and pteridophyta
b) Dicots, monocots, gymnosperms
c) Bryophyta and pteridophyta
d) Only thallophyta

Let's analyze each option to determine the correct answer:

a) Gymnosperms and pteridophyta:
Gymnosperms are a group of seed-producing plants that include conifers, cycads, and ginkgo. They have naked seeds exposed on the surface of cones or other structures. Pteridophyta, on the other hand, refers to ferns and fern allies, which are non-flowering vascular plants. While both gymnosperms and pteridophyta reproduce through spores, they do not exhibit zooidogamy. Therefore, option 'a' is incorrect.

b) Dicots, monocots, gymnosperms:
Dicots and monocots are two major groups of flowering plants, also known as angiosperms. They reproduce through the pollination process, where pollen is transferred from the male reproductive structure (stamen) to the female reproductive structure (pistil). Gymnosperms, as mentioned earlier, reproduce through seeds. None of these three groups exhibit zooidogamy. Therefore, option 'b' is incorrect.

c) Bryophyta and pteridophyta:
Bryophyta refers to the group of non-vascular plants that includes mosses, liverworts, and hornworts. They reproduce through spores and do not produce flowers or seeds. Pteridophyta, as mentioned earlier, includes ferns and fern allies. Both bryophyta and pteridophyta exhibit zooidogamy, where the male gametes are flagellated and are carried to the female gametes by water or small animals. Therefore, option 'c' is correct.

d) Only thallophyta:
Thallophyta is a division of plants that includes algae and fungi. While some algae exhibit zooidogamy, fungi do not. Therefore, option 'd' is incorrect.

In conclusion, the correct answer is option 'c' - Bryophyta and pteridophyta.

C is correct.