which object would be the best addition to a collection of writing instruments that are unique to the twentieth century?
A. a pencil
B. A computer
C. a crayon
D. a calligraphy pen
D. a calligraphy pen
A calligraphy pen would be the best addition to a collection of writing instruments that are unique to the twentieth century as it is a traditional writing tool that was widely used during that time period and is known for its beautiful and decorative writing style.