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Following reaction(s) is / are involved ...

Following reaction(s) is / are involved in thermite process

(A) `3Mn_(3)O_(4)`+8Al `rarr`9Mn+4`Al_(2)O_(3)`
(B) `2Cu_(2)O` + `Cu_(2)S` `rarr` 6Cu + `SO_(2)`
(C) `Cr_(2)O_(3)`+ 2Al `rarr ` `Al_(2)O_(3)`+2Cr
(D) `Fe_(2)O_(3)` + 3CO `rarr`2Fe + `3CO_(2)`

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