Disease caused by viruses is___________

Correct option is C

Bunchy top of banana is a disease caused by the Banana bunchy top virus (BBTV). This viral disease affects banana plants, causing characteristic symptoms such as bunched leaves or "rosettes" at the top of the plant. Blight and blast are generally caused by fungal organisms, and downy mildew is also a disease caused by oomycetes, which are fungus-like microorganisms.