AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
Option C: 25 to 40 times.
Between 1820 and 1914, world trade multiplied by 25 to 40 times, largely driven by the rapid growth of primary product exports.
This fact is a standard data point from Chapter 3 (The Making of a Global World) of the NCERT Class 10 Social Science textbook. It is a commonly tested statistic in MCQs. Note that the source passages provided do not directly state this figure, but the correct answer per the NCERT textbook is C (25 to 40 times). Memorise key trade statistics (e.g., 8% annual growth post-1950 Bretton Woods; 25–40x trade growth 1820–1914) as examiners frequently set one-mark MCQs on them.