[单选题]
12.20: “Both the positx.;0li pvhi 3qion vbcwfa( )1c:lfecn)5 and momentum of an electron cannot be known exactly at the same i( ec f)wn )f5cva1lb:cnstant of time.” To whom is this concept attributed?
A. Pauli
B. de Broglie
C. Einstein
D. Dirac
E. Heisenberg
