From the words or group of words lettered A to D, choose the word or group of words that best completes each of the following sentences. Their _____ house i...

From the words or group of words lettered A to D, choose the word or group of words that best completes each of the following sentences.

Their _____ house is by the side of the road. 

Answer Details

The correct answer is "father-in-law's". This is because the possessive apostrophe " 's" is used to indicate that the house belongs to the father-in-law of the person speaking. The other options are incorrect because they either use the plural form "fathers-in-law" or incorrectly place the apostrophe before "s".