Which of the following is the primary cause of blackleg?

Which of the following is the primary cause of blackleg?

مندرجہ ذیل میں سے کون سا بلیکلیگ کی بنیادی وجہ ہے؟
Explanation

Blackleg is caused by Clostridium chauvoei, a bacterial infection that produces toxins leading to muscle necrosis.

It mainly affects young cattle.

It is characterized by sudden death and gas-filled swelling in muscles.