Correct option is D
Statements:
Some floors are plates.
No plate is a sofa.
All gardens are plates.

Conclusions:
I. Some floors being gardens is a possibility.- True - there are not any negative relation is given between them so any definite possibility will always be true.
II. No garden is a sofa. True - clearly given no plates are sofa and all garden are restricted with plates.
III. All plates are gardens. False - whole area of plates is not inside of gardens.
IV. No floors is a sofa. False- there is no direct relation is given between them- so any definite relation between them will not true.
Only Conclusions I and II follow