为自己加油

"The quantity transmitter consists of 10 reed switches and three diodes inside a tube." We can infer from the above sentence that there are ______.

A.10个簧片开关和3个二极管;
B.10个簧片开关和3个三极管;
C.10个磁力开关和3个氧气管;
D.10个磁力开关和3个三极管;