$PusaKomal$ variety of CowPea is resistant to disease

The correct option is B Bacterial blight
White rust
White rust is a fungal disease caused by $Albugocandida$ that mainly affects plants like cauliflower belonging to the genus Brassica.

Leaf curl
Leaf curls are caused by fungi and certain viruses. Viral Leaf curl is usually seen in tomatoes and plants of the Solanaceae family. Peach, almond and nectarine trees show fungal Leaf curl.

Bacterial blight
Bacterial blight is caused by $Pseudomonassyringae$. The main symptom of this disease is the development of brown necrotic leaf spots with yellow halos.The disease is caused by sowing infected seed within a field.

$Pusakomal$ is a variety of cowpea that is resistant to bacterial blight.

Hill bunt
Hill bunt is a disease of wheat that causes discoloration in the grains. The grains are full of black powder and give off a foul smell.