Simon Commission of 1927 was boycotted because

The Simon Commission was widely boycotted because it comprised only British members and excluded any Indian representation, an act regarded as an affront to Indian political aspirations; the commission’s all-white membership was explicitly described as an insult, prompting the Congress resolution to boycott it in 1927 [2]. The exclusion galvanized major nationalist groups: the Congress led the boycott at its Madras session, and sections of the Muslim League and the Hindu Mahasabha backed the decision, while a few regional parties chose not to participate [3]. Given this clear and contemporaneous reaction centered on lack of Indian members, the correct answer is option (1).

Sources

1. [1] History , class XII (Tamilnadu state board 2024 ed.) > Chapter 4: Advent of Gandhi and Mass Mobilisation > 4.6 Simon Commission– Nehru Report – Lahore Congress > p. 50
2. [2] Rajiv Ahir. A Brief History of Modern India (2019 ed.). SPECTRUM. > Chapter 18: Simon Commission and the Nehru Report > Simon Commission > p. 365
3. [3] Rajiv Ahir. A Brief History of Modern India (2019 ed.). SPECTRUM. > Chapter 18: Simon Commission and the Nehru Report > Other Groups > p. 358