Select the most appropriate option to fill in the blank.

The commander abjured his ______to the king.

allegiance

The most appropriate option to fill in the blank is allegiance.

The word "allegiance" means "loyalty or faithfulness to a person or cause." This is the most appropriate word because it accurately describes how the commander renounced his loyalty to the king.

The other options are not as appropriate.

• Regulation refers to a rule or order that must be obeyed. This does not make sense in the context of the sentence, because the commander was not renouncing a rule or order.
• Reliance refers to the act of relying on something or someone. This does not make sense in the context of the sentence, because the commander was not renouncing his reliance on something or someone.
• Sequence refers to the order in which things happen. This does not make sense in the context of the sentence, because the commander was not renouncing the order in which things happened.