Identify from the following, the correct statements with reference to the characteristics of intensive subsistence agriculture dominated by wet paddy cultivation.
(A) Land holdings are very small due to the high density of population.
(B) Farmers work with the help of family labour leading to intensive use of land.
(C) Farm yard manure is used to maintain the fertility of the soil.
(D) The yield per unit area is low, but productivity per labour is high.