— Hello! May I speak to Michael?

— ______ Who is that? [ ]

A. This is Michael speaking.

B. Anything wrong?

C. No, you can't speak.

D. Are you Michael?

已知只有质子数或中子数为奇数的原子核有核磁共振（NMR）现象，试判断下列哪组原子均可产生NMR现象[ ]

A．¹⁸O      ³¹P      ³⁵Cl

B．²⁷Al      ¹⁹F      ¹²C

C．第一周期所有元素的原子

D．元素周期表中ⅤA所有元素的原子