Solution: The fungus Puccinia graminis causes stem, black, and cereal rusts. It belongs to the phylum Basidiomycota, which is part of the kingdom Fungi. Infected plants produce fewer tillers and seeds, and in extreme cases of infection, they may die.  

Smut of Bajra is caused by Tolysporium penicillariae which is a fungus,.

Sugarcane red rot is a serious disease that affects the plant. Colletotrichum falcatum is the culprit. The fungus’s mycelium infects the host tissue’s parenchymatous cells.

Xanthomonas campestris causes black rot in crucifers. This is a bacterium is most commonly introduced into a garden on or in sensitive vegetable seeds and transplants.

So, the correct answer is (c).