The correct answer is C. in.
A bed is a piece of furniture that is used for sleeping. It is typically made up of a mattress, a frame, and sheets. Beds can be found in many different places, including bedrooms, dormitories, and hospitals.
In the sentence “There is a bed in my room,” the word “in” indicates that the bed is located inside the room. This is in contrast to the other options, which would indicate that the bed is located somewhere else.
The option “under” would indicate that the bed is located underneath something else, such as a table or a chair. The option “on” would indicate that the bed is located on top of something else, such as a floor or a table. The option “none of the above” would indicate that the bed is not located in any of the places listed in the other options.