The correct answer is D. Sun glasses.
Sun glasses are made of dark, tinted lenses that block out most of the visible light. This is done to protect the eyes from the sun’s harmful UV rays. The other options, notebook paper, water, and book, are all transparent and allow light to pass through them.
Notebook paper is made of a thin layer of wood pulp that is coated with a white pigment. This pigment reflects light, making the paper appear white. Water is a transparent liquid that is made up of hydrogen and oxygen atoms. The atoms in water are arranged in a way that allows light to pass through them. Books are made of paper that is bound together in a cover. The paper in a book is usually white or off-white, and it is often printed with text or images. The ink used to print books is opaque, which means that it blocks light. This is why you cannot see through a book.
Sun glasses are the only option that does not allow light to pass through. This is because the lenses in sun glasses are made of a dark, tinted material that absorbs light. The
absorption of light by the lenses in sun glasses helps to protect the eyes from the sun’s harmful UV rays.