Choose the correct meaning of idiom:
At sixes and sevens

The correct answer is In complete confusion.

Explanation:

The idiom "at sixes and sevens" is an English phrase used to describe a state of confusion, disorder, or disarray. When someone or something is "at sixes and sevens," it means things are disorganized, haphazard, or unsettled.

Breakdown of the options:

• A dilemma between two evils: Refers to a situation where one must choose between two equally unpleasant options (often described as "between a rock and a hard place").
• A free and fair decision: Describes an unbiased and just choice.
• In complete confusion: This is the correct meaning of the idiom "at sixes and sevens".
• A selection made under duress: Means a choice forced by threat or coercion.

Therefore, the correct choice is In complete confusion.