Which spore of rust fungus is repeating spore?

Answer: Option C

The Urediospore spore of rust fungus is repeating.
Rusts are plant diseases caused by pathogenic fungi of the order Pucciniales. Rust fungi are highly specialized plant pathogens with several unique features.
These serve as repeating dikaryotic vegetative spores. These spores are referred to as the repeating stage because they can cause auto-infection on the primary host, re-infecting the same host on which the spores were produced.