Question

which list of radioisotope contains an alpha emitter, a beta emitter, and a positron emitter?

Answer 1

It seems that you have not included the answer choices...
I googled the question anyway and of the four possible choices:
A. C-14, N-16, P-32
B. Cs-137, Fr-220, Tc-99
C. Kr-85, Ne-19, Rn-222
D. Pu-239, Th-232, U-238

The answer would be C.

All you have to remember for these questions is an Alpha Emitter loses a mass of 4 and has an atomic number 2 less. A beta emitter will produce one less electron, while a positron one more. Therefore the beta emitter will make the atomic number go up 1 while a positron emitter will make it go down 1.