Substitute one word for the bold expression.
He was arrested for the murder of the king.

Correct option is D

The correct one-word substitute for "the murder of the king" is (d) regicide.
• Regicide: refers to the act of killing a king.
• Regicide: राजहत्या (Hindi meaning).
• Example: The plotters were charged with regicide after the assassination of the monarch.
Meanings of the given other options:
• (a) Suicide: The act of intentionally causing one's own death.
• (b) Fratricide: The act of killing one's own brother.
• (c) Homicide: The act of killing another human being; murder.