Jawaharlal Nehru stepped forward as an important national leader during the agitation against the arrival of the Simon Commission. The Simon Commission was a British parliamentary body sent to India in 1928 to discuss constitutional reforms. However, the Commission did not include any Indian members, which led to widespread protests and criticisms from the Indian nationalists.

During this time, Nehru emerged as a prominent leader who strongly opposed the Simon Commission. He played an active role in organizing protests, delivering speeches, and rallying support against the Commission. Nehru`s involvement in this agitation helped to mobilize the Indian masses and raise awareness about the need for self-governance and independence.

It is important to note that while Nehru had been involved in national politics prior to this event, it was his leadership during the Simon Commission agitation that brought him to the forefront as a significant figure in the fight for Indian independence.

Alert - correct answer should be option 4 Agitation against the arrival of Simon Commission.