The spore-producing protists amongst the given answers are red algae, i.e., option C.
Spores are reproductive cells that protists and other organisms produce. When two protist spores come into contact, they can fuse to form a diploid zygote. The zygote then goes through meiosis, producing haploid cells that continue the cycle.
Red algae reproduce both sexually and asexually. Asexual reproduction can occur via spore production as well as vegetative reproduction.
Thus, the correct option is C.
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