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The sampling method involved in selecting every 13th employee from a list is systematic sampling. This technique allows you to select members from a larger population by choosing a starting point at random and then selecting every nth member. In this case, “every 13th employee” signifies that the survey is using a fixed interval to ensure an even distribution across the entire list.

While systematic sampling isn't explicitly listed among your choices, the correct understanding of this method helps clarify why the others do not fit.

A simple random sample would involve choosing individuals entirely at random without any predetermined method or interval. A convenience sample typically selects individuals who are easiest to reach, lacking a structured approach. Stratified random sampling entails dividing the population into distinct subgroups and randomly sampling from these groups, which differs from using a fixed interval. A judgment sample relies on the researcher's discretion to select individuals, which does not fit the systematic approach.

Thus, the act of choosing every 13th employee reflects a systematic method rather than any of those options.