一次学术会议安排3名教授和2名副教授作报告,要求第一个和最后一个作报告的都是教授。如在满足此要求的安排中随机选择一种,则2名副教授的发言次序相邻的概率为()。
A <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251120/22942818_0.png"> B
<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251120/22942818_0_1.png"> C
<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251120/22942818_0_2.png"> D
<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251120/22942818_0_3.png">