To answer this question, we need to understand the history of the fountain pen.
Option A) Trevor Baylis - This option is incorrect. Trevor Baylis is known for inventing the wind-up radio, not the fountain pen.
Option B) Slavoljub Eduard Penkala - This option is incorrect. Slavoljub Eduard Penkala, a Polish engineer, invented the mechanical pencil and the ballpoint pen, but not the fountain pen.
Option C) Bernard Tellegen - This option is incorrect. Bernard Tellegen, a Dutch engineer, made significant contributions to the development of electronic devices, but he did not invent the fountain pen.
Option D) Petrache Poenaru - This option is correct. Petrache Poenaru, a Romanian inventor and engineer, is credited with inventing the fountain pen in 1827. His design included an ink reservoir and a system that allowed a controlled flow of ink to the nib.
The correct answer is D) Petrache Poenaru. He is the inventor of the fountain pen.