Kelly was building a bed for her dollhouse. she used her bed, which is 4 feet × 6 feet, as a guide. she scaled down the dimensions of her bed by a factor 1 over 5. what are the dimensions of the model bed she built?

Hey! 
So when there is a scale factor you would always multiply it with the original dimensions, even if it wasn't a fraction.
so 4 time 1/5 is 0.8
and 6 times 1/5 is 1.2
so the dimensions of the model bed is 0.8 foot by 1.2 feet
Your answer is A!
Hope this helps!