Answer: Option (#) is the correct answer.
Step-by-step explanation:
Particles emitted by the given radioisotopes are as follows.

A beta particle is emitted by Cs-137

A positron is emitted by Fe-53.

An alpha particle is emitted by Fr-220
[tex]^{3}_{1}H \rightarrow ^{3}_{2}He^{1+} + e^{-}/tex]
Thus, we can conclude that Fr-220 radioisotope emits particles having the greatest mass.