Explanation:

- Option 1: The Rowlatt Act did not involve compulsory economic support for war efforts.

- Option 2: The core aim of the Rowlatt Act, enacted in 1919, was to extend repressive wartime measures which included the authorization of imprisonment without trial and the use of summary procedures for trial. This aimed to curb revolutionary activities.

- Option 3: The Rowlatt Act was not specifically aimed at suppressing the Khilafat Movement, which was a separate issue concerning support for the Ottoman Caliphate.

- Option 4: While the Rowlatt Act did allow for censorship and restrictions on the press, the main focus was on detention without trial.