D) 3, 5 and 8
 

ECONOMIC FACTORS
1. Lower Canada was experiencing a serious agricultural crisis.
2. The timber trade was concentrated in Upper Canada.
3. England abolished free trade.  Not Correct !

SOCIAL FACTORS
4. The Loyalists were moving into Lower Canada.
5. Large numbers of British immigrants arrived in Lower Canada.  Correct !
6. Thousands of French Canadians emigrated to the United States.

POLITICAL FACTORS
7. The Governor refused to give the members of the Legislative Assembly control over the budget.
8. The Legislative Assembly was primarily composed of British representatives.  Not Correct !
9. The British Parliament refused to unite the two Canadas.