The right option is; c. A sample
A portion of the population selected to represent the population is called a sample.
A sample is the smaller part of a larger group selected to represent the whole group. A sample is expected to represent the whole population and not to show any prejudice or differences toward a certain characteristic. In experimental studies, samples are used when the size of a population is too large and in order to ensure that all members of a population are equally observed and selected.
