B) 1,   4,    6

FUR TRADE
Not Correct !    1. Because of increasing demand for furs in Europe, the fur trade was the driving force behind
                              the economy.
                           2. Europeans were less and less interested in fur products, and the fur trade declined.

TIMBER TRADE
                           3. The timber trade stopped growing because of the lack of skilled labour.
Correct !           4. During the Napoleonic Wars, Britain turned to its colony to fulfil its timber needs.

AGRICULTURE
                            5. Crop production declined because of poor farming techniques and soil exhaustion.
Not Correct !      6. Crop production experienced tremendous growth because of the use of fertilizers.