(Choose 1 ans In a defined target population, there are 1,950 small firms, 45 medium sized firms, and 5 large firms. A researcher is interested in drawing a probability sample from this population. However, given the greater economic significance of the five large firms, he wants to draw more heavily from that group. Given this objective, the researcher should use:
A. simple random sampling
B. systematic random sampling
C. disproportionately stratified sampling.
D. cluster sampling
E. snowball sampling
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