在下列三个逻辑函数表达式中,____是最小项表达式。( )

A、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/15087281477007e01e2fb58e148e1a1c8f2e3953d80c0image4.png">

B、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1508728147822468ce88ba6a24519823bac7327f76943image5.png">

C、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/15087281479087a644df61bac4807ab79735805fe2b97image6.png">