7315. We don’t know how we are to recompense you for the trouble you have taken.

✅ The correct answer is option A.
Reward : a thing given in recognition of service, effort, or achievement.

Help : make it easier or possible for (someone) to do something by offering them one’s services or resources.

Praise : express warm approval or admiration of.

Thank : express gratitude to (someone), especially by saying ‘Thank you’.

Recompense : pay or reward (someone) for effort or work.

Synonym of Recompense is Reward