Under______ , the French Canadian farming economy of the St. Lawrence valley and its language, religion, and customs continued unchange
A、the Quebec Act of 1774
B、the Treaty of Paris in 1763
C、the Constitutional Act of 1791
D、the Act of Union in 1840
【正确答案】：A
【题目解析】：根据1774年的《魁北克法案》，圣劳伦斯山谷的法裔加拿大农业经济及其语言、宗教和习俗保持不变。
