Which of the following are redox reactions

A
BaO
2
​
+H
2
​
SO
4
​
→BaSO
4
​
+H
2
​
O
2
​

B
2BaO+O
2
​
→2BaO
2
​

C
2KClO
3
​
→2KCl+3O
2
​

D
SO
2
​
+2H
2
​
S→2H
2
​
O+3S

Correct options are B) , C) and D)