'Chore' means a job or a piece of work that is often boring or is unpleasant but needs to be done regularly.
Option A - 'Theif' is a person who steals. Thus option A is incorrect.
Option B - 'Relief' means a feeling of happiness that something unpleasant has not happened. Thus option B is incorrect.
Option C - 'Colours' are red, blue, green etc. Thus option C is incorrect.
Option D - 'Task' means a piece of work to be done. Thus option D is the correct answer,
'Chore - Task'