1) a) bedroom b) house c) bathroom

The question asks to choose the correct option. Based on common English usage, 'bedroom' is a room in a house. 'House' is a building. 'Bathroom' is a room in a house. Without further context or a sentence to complete, it's impossible to definitively choose one. However, if this is a vocabulary matching exercise, all options are valid words. Assuming a context where one word is more appropriate than others, further information is needed.