A:
Marries again when his first but divorced wife is still alive
B:
Marries again when his first wife is dead
C:
Marries again when he already has a legally wedded wife alive
D:
Has Sexual intercourse with a women other than his wife
Explanation
C: Marries again when he already has a legally wedded wife alive.
Bigamy refers to the act of marrying someone while still being legally married to someone else. Therefore, option C is the correct answer as it describes a situation where a man is already married but goes ahead to marry another woman while his first wife is still alive.