The Rowlatt Act aimed at

1. The Rowlatt Act, officially known as the Anarchical and Revolutionary Crimes Act of 1919, was passed by the Imperial Legislative Council in Delhi. 2. It was based on the recommendations of the Sedition Committee headed by Sir Sidney Rowlatt. 3. The primary aim of the Act was to curb the growing nationalist upsurge in the country and deal with revolutionary activities. 4. Option (B) accurately describes its key provisions: the Act indefinitely extended the emergency measures of preventive detention provided for in the Defence of India Act 1915. It empowered the government with extraordinary powers to detain suspects without trial for up to two years (imprisonment without trial) and provided for faster, summary procedures for trial of political cases without juries. 5. Option (A) is incorrect; while economic support for war was extracted, it was not the specific aim of the Rowlatt Act. 6. Option (C) is incorrect; while the Act could be used against any movement, its specific aim was broader than just suppressing the Khilafat Movement. 7. Option (D) is incorrect; while restrictions on the press were often imposed, this Act focused primarily on powers of detention and trial.