किस समाज सुधारक और लेखक ने 'गुलामगिरी' पुस्तक लिखी थी, जिसने जाति व्यवस्था की कड़ी आलोचना की थी?

Who among the following was a Sanskrit scholar and helped in opening about 35 girls' schools in Bengal?

In which year was Act XV enacted by the British East India Company to remove all legal obstacles to the remarriage of Hindu widows?

In which year was the practice of Sati formally banned in British India?