The people of India agitated against the arrival of the Simon Commission primarily because there was no Indian member in the Commission.

The Simon Commission, officially known as the Indian Statutory Commission, was formed in 1927 by the British government to review and propose constitutional reforms for British India. The absence of any Indian member in the Commission was seen as an insult and a disregard for the aspirations of the Indian people. The Indian National Congress and other political organizations boycotted the Commission and launched protests and demonstrations against its arrival.

The other options mentioned in the question were not the primary reasons for the agitation against the Simon Commission. The Act of 1919, also known as the Montagu-Chelmsford Reforms, had already been implemented, and the Commission was seen as an opportunity to further discuss and negotiate constitutional reforms. The recommendations of the Simon Commission did not explicitly suggest the abolition of Dyarchy or the partition of the country.

Therefore, the correct answer is "There was no Indian member in the Simon Commission."