The suffix '-en' is added to the noun 'wood' forming an adjective that means 'made of wood'. In the sentence, "The house was adorned with wooden furniture" the adjective 'wooden' modifies the noun 'furniture', meaning 'the furniture is made of wood'. The words woodness, woodous, woodable don't exist in the dictionary, they're not used in Standard English hence options A, B and D are incorrect.