This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to buy a mobile home
Decide how much space you need.
Mobile homes come in different sizes with different amounts of bedrooms. Consider how many people will be living in your house and decide how many bedrooms you need.

[a]. Mobile homes typically come in 3 different sizes, single wide, double wide, and triple wide. Single wides are typically long and narrow with their rooms connecting without hallways..
[b]. Have a copy of a listing for each room on your list. You may be able to rent a home as a temporary home or as a home purchase for a family member who will only be living there for a few months or to the next year..
[c]. If you will be in a tiny apartment or a five-bedroom house with 20 bedrooms, you would want to think about how many bedrooms are you going to require. Determining how many bedrooms you can realistically have in your new home is a rough estimate..
[d]. Most mobile homes will come with their significant other's smart phone or tablet with certain rooms turned into mini-bedrooms. Mobile homes can range from one 2 bedroom home to a house that houses up to two bedrooms..
The answer is:
[a].