AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
Option A is correct. Both (A) and (R) are true and (R) is the correct explanation of (A). After Rinderpest destroyed cattle, colonisers monopolised scarce cattle resources, using this economic leverage to force Africans into wage labour on plantations and mines.
The textbook explicitly states that planters and mine owners "successfully monopolised what scarce cattle resources remained… to force Africans into the labour market," and that "control over the scarce resource of cattle enabled European colonisers to conquer and subdue Africa." R directly explains the mechanism behind A, so Option A is correct.