The ______ was started by the Sikh reformers to purify their religions places by removing the evil social practices that had slowly crept into them.

Correct option is B

The Akali Movement was started by the Sikh reformers to purify their religious places by removing the evil social practices that had slowly crept into them. So, the answer is (b).
The Akali movement, also called the Gurdwara Reform Movement, was a campaign to bring reform in the gurdwaras (the Sikh places of worship) in India during the early 1920s.
The movement led to the introduction of the Sikh Gurdwara Bill in 1925, which placed all the historical Sikh shrines in India under the control of Shiromani Gurdwara Parbandhak Committee (SGPC).