Step 1: Fix the definitions.
- Population: the entire set of elements of interest.
- Sampling frame: an operational list or explicit set of rules that identifies all (or nearly all) elements of the target population so we can draw the sample.
- Sampling unit: the basic unit actually selected at a stage of sampling (e.g., household, store).
- Sample: the subset we actually observe.
Step 2: Map the stem to the correct term.
The stem asks for a “representation of the elements … list or set of directions for identifying the target population.” This is exactly the sampling frame.
Step 3: Eliminate distractors.
- (a) Judgmental sample = a nonprobability sample chosen by expert judgment.
- (b) Sample = selected subset, not the list you select from.
- (c) Sampling unit = the entity selected at a stage, not the list of all entities.
\[
\boxed{(d)}
\]