【单选题】

According to the passage, all of the following were true of the center of the atom EXCEPT that it
A．(A) had not yet been seen by the naked eye

B．(B) contained elements that were positively charged
C．(C) was very little larger than a molecule
D．(D) followed experimentally determinable processes
E．(E) was smaller than 1/125 millionth of an inch