Sections 24–26 not apply to Chenab Canal land before:

Legal provisions often have specific commencement dates or dates from which they become applicable to certain regions or situations. These dates are crucial for understanding the historical and geographical scope of a law.

• Option B: 12 Aug 1896 is the correct date before which Sections 24–26 did not apply to Chenab Canal land. This specific date marks a legislative cut-off, indicating when these particular sections of an act (likely related to canal administration or land laws) became effective for that specific area.
• Options A (1 Jan 1890), C (21 Jun 1912), and D (1 Apr 1893) are incorrect dates. These dates do not correspond to the specific historical legislative timeline for the application of Sections 24–26 to the Chenab Canal land.