Explanation: From the late 1890s there were growing differences within the INC.

• Leaders like Bipin Chandra Pal, Bal Gangadhar Tilak and Lala Lajpat Rai were advocating radical approaches instead of merely writing petitions, prayers and memorandums.
• These advocates of radical methods came to be called the “extremists” as against those who were identified as moderates.

Source: Tamil Nadu NCERT