Complete the story about a chronic overpacker by selecting the grammatically correct word.

When she packed three giant suitcases for a simple weekend trip, Clara firmly believed she ______ need at least fourteen different outfits.

The correct answer is would.

When reporting a past thought or belief about the future, the modal verb will shifts to would. Clara's past thought was "I will need fourteen outfits," which becomes "she believed she would need" in the past narrative.