Final answer:
To assess the reliability of secondary data sources in the international market, the key question is whether the data are internally consistent with known data sources. This assures the accuracy and reliability necessary for informed decision-making. Option D is correct.
Step-by-step explanation:
When a marketing researcher is trying to establish the reliability of secondary data sources in the international arena, several critical questions need consideration. The question that should be asked by a marketing researcher is D) Are the data internally consistent in light of known data sources? This question addresses the consistency and accuracy of the collected data in comparison to other established data sources, which is essential for ensuring that the data is reliable and can be used to make informed decisions. Internal consistency involves checking the data against itself and other data to identify any discrepancies or issues that could compromise its reliability.
Other factors that a marketing researcher may also consider include the origin of the data, the methodology used to collect it, and potential biases or limitations. Additionally, aspects such as the research design, sample size, and data collection methods are crucial points of evaluation in the context of secondary data use in marketing research.