Detailed Explanation:
Systematic sampling involves selecting every nth individual from a list or sequence after a random start.
Option C: Systematic
By choosing every fourth patient after arandom start, the researcher is using systematic sampling.
Option A: Simple
Simple random sampling would involve selecting individuals at random, without a set interval.
Options B and D:
Convenience sampling is based on ease of access, and stratified sampling divides the population into subgroups before random selection.
[References:, Systematic sampling is well-described in research methods literature, where interval selection following a random start is a key feature., , , , , , ]
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