下图为人类某种单基因遗传病的系谱图，Ⅱ₄为患者。相关叙述不合理的是

A．该病属于隐性遗传病，但致病基因不一定在常染色体上

B．若Ⅰ₂携带致病基因，则Ⅰ₁、Ⅰ₂再生一患病男孩的概率为1/8

C．该病易受环境影响，Ⅱ₃是携带者的概率为1/2

D．若Ⅰ₂不携带致病基因，则Ⅰ₁的一个初级卵母细胞中含2个致病基因

The coach explained the regulations at length to make sure that none of his players world become violators.

A. at last
B. at large
C. in detail
D. in short