Bohr was presented atomic model of hydrogen in:

Explanation

In 1913, Niels Bohr introduced his atomic model for hydrogen. He suggested that electrons move in fixed orbits around the nucleus, which was a breakthrough in understanding atomic structure.In 1919, there was a significant event called the Treaty of Versailles, which ended World War I. This treaty had major implications for the future of Europe.In 1918, the global influenza pandemic, known as the Spanish flu, caused widespread illness and death around the world. It was a devastating time for many countries.In 1905, Albert Einstein published his theory of special relativity, which transformed our understanding of space, time, and energy. It was a groundbreaking year for physics.So, the correct answer is (a) 1913, when Niels Bohr presented his atomic model of hydrogen. It was a pivotal moment in the history of science!