By the Statute of Westminster in 1931, Canada____________.
A、took Newfoundland as its tenth province
B、became a member of the Commonwealth of Nations
C、found rich oil fields in Alberta and other western provinces
D、opened the St. Lawrence Seaway for further growth in economy
【正确答案】：B
【题目解析】：根据1931年的《威斯敏斯特条例》，加拿大成为英联邦国家的成员。