Explanation :
There are three types of mirrors i.e. plane mirror, concave mirror, and the convex mirror.
The concave and convex mirrors are spherical mirrors. The back side of a spoon forms a convex mirror.
The image formed by a convex mirror is the real and diminished image.
Also, the image is erect. While on the front side of the mirror, the concave mirror is formed.
So, the correct option is (C) " right-side up and smaller ".