The four sentences labelled A, B, C and D, given below in jumbled order, together form a coherent paragraph. Arrange the sentences in the most logical order and choose the sequence that produces the best paragraph.

A. The collective now lends traditional seed to any grower who returns double the quantity after harvest.
B. Those revived varieties proved their worth last season, surviving a saline spell that damaged the hybrid crop in neighbouring fields.
C. When high yielding hybrid seeds spread through the delta in the 1980s, most of those local varieties quietly vanished from the fields.
D. For generations, farmers in the delta grew dozens of native rice varieties suited to its salty soils and seasonal floods.