Option 1 suggests that both the assertion and the reason are true and that the reason is the correct explanation of the assertion. This would mean that the percentage of net sown area in Andhra Pradesh is indeed less compared to West Bengal due to the laterite soil in Andhra Pradesh.
Option 2 also indicates that both the assertion and the reason are true, however, here the reason does not correctly explain the assertion. This means the soil in Andhra Pradesh being laterite does not have a direct bearing on the net sown area.
Option 3, which is the correct answer, states that the assertion is true and the reason is false; that means the percentage of net sown area in Andhra Pradesh is indeed less compared to West Bengal, yet the soil in Andhra Pradesh is not laterite.
Lastly, option 4 states that the assertion is false but the reason is true; the percentage of net sown area in Andhra Pradesh is not less compared to West Bengal, yet the soil in Andhra Pradesh is still laterite.