Which of the Following Precursors Would Be Most Appropriate to Use

Multiple Choice

Which of the following precursors would be most appropriate to use in an experiment of the first 10 nucleotides in the initiation phase of transcription?

A) [ $\alpha$ -³²P]ATP
B) [¹⁴-C]dATP
C) [ $\beta$ -³²P]ATP
D) [ $\gamma$ -³²P]ATP
E) [¹⁴C]CTP