Correct option is B
Logic: all are writing instruments.
Check each option:
Option A: Chalk
→ Chalk is used for writing or drawing on a board or surface.
Option B: Paper
→ It is not a writing tool but rather a writing surface.
Option C: Pen
→ A pen is used for writing on paper or other surfaces.
Option D: Pencil
→ A pencil is used for writing and drawing on paper.
Chalk, Pen, and Pencil are all writing instruments.
So, Paper is different because it is not a writing instrument but a surface used for writing.
Thus, the correct option is: (b) Paper.