Stage-II of rust fungi is marked by

Answer: Option D

Stage II of rust fungi are marked by Urediniospores.
Urediniospores are thin-walled spores produced by the uredium, a stage in the life cycle of rusts.
Urediniospores usually have two dikaryote nuclei within one cell. In mass, they are usually pale brown in contrast to teliospores which are generally dark brown.