_______ sample is the most basic form of probability sampling. Systematic random Simple random Quota Cluster

The most basic form of probability sampling is Simple random sampling.

Explanation

Simple random sampling is a fundamental sampling method where every member of a population has an equal chance of being selected. This is essential for ensuring that the sample represents the population without bias. In contrast, other methods like systematic random sampling, quota sampling, and cluster sampling introduce specific criteria or structures that can affect the randomness of the selection process.

In systematic random sampling, for example, you select every k-th member from a list, while quota sampling involves selecting a specific number of subjects from different subgroups. Cluster sampling divides the population into clusters and samples entire clusters, which may not provide a purely random sample.

Therefore, Simple random sampling is the best choice among the options given.