Which type of radiation is the smallest in size?
alpha radiation
beta radiation
gamma radiation
positron radiation

C) gamma radiation

Explanation:

There are three major types of particles emitted during a radioactive decay. These include: alpha, beta and gamma particles. Positrons are essentially positively charged beta particles

Alpha particles tend to be slow moving and heavy. Beta particles are similar to electrons while gamma particles are the lightest, fast moving and highly penetrating.