Concept:Matching research terms with their correct definitions requires understanding each term's precise meaning in sampling.
Explanation:A sampling frame is a complete list of all population elements from which a sample is drawn. It matches with (I).
A sample unit is a single member of the sample. This matches with (IV).
Sampling error happens when the sample does not accurately represent the population. This matches with (II).
A sample is a subset containing some elements of the population. This matches with (III).
Thus, the correct pairing is: (A) with (I), (B) with (IV), (C) with (II), (D) with (III).
Answer:(A) - (I), (B) - (IV), (C) - (II), (D) - (III) – Option D.