Correct Option (A)
The Government of India Act of 1935 abolished dyarchy in the provinces and introduced provincial autonomy in its place. However, it introduced dyarchy at the Centre. This meant that subjects were divided into 'reserved' and 'transferred' categories at the central level. The Governor-General and his councillors administered the reserved subjects, while the Governor-General acted on the advice of ministers responsible to the legislature for the transferred subjects.
Incorrect Options:
B) A bicameral legislature was a feature of the Government of India Act of 1935. The Act provided for a bicameral federal legislature comprising a Federal Assembly (lower house) and a Council of State (upper house).
C) Provincial autonomy was a significant feature introduced by the Government of India Act of 1935. It abolished dyarchy in the provinces and granted provinces more independence in administering their affairs, within defined limits. Ministers were made responsible to the provincial legislatures.
D) The Government of India Act of 1935 proposed the establishment of an All-India Federation. This federation was to consist of British Indian provinces and princely states. However, the princely states did not join, and thus the federation never materialized.