Final answer:
Fungi are classified in their kingdom because they have cell walls made of chitin, are heterotrophic, reproduce through asexual reproduction, and are eukaryotes. So the correct option is A.
Step-by-step explanation:
Fungi are classified in their kingdom separate from plants because they have distinct traits that set them apart. One of the key differences is that fungi have cell walls made of chitin, while plants have cell walls made of cellulose. Additionally, fungi are heterotrophic, meaning they obtain nutrients from other organisms, while plants are autotrophic and can perform photosynthesis to make their food. Fungi also reproduce through asexual reproduction, while plants reproduce sexually or asexually. Lastly, fungi are eukaryotes, not prokaryotes like bacteria.