Pick up the correct statement from the following:

A. Alexander Parkes, a Scottish chemist prepared a hard material by mixing camphor and alcohol with nitro cellulose and called it, as Parkesite

B. Dr. L. Bakeland, a Belgian scientist prepared a product known as Bakelite

C. Pollark, an Austrian scientist prepared a substance from urea and formaldehyde and called it Plastic

D. All the above

Answer: Option D