The disadvantages of a personal interview include:
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They are time consuming: Conducting personal interviews often requires a significant investment of time, both in terms of scheduling and administering the interviews.
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The data can be difficult to combine: Responses can vary widely, making it difficult to aggregate and analyze the data effectively.
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Reviewing the answers is time consuming: Analyzing qualitative responses can take more time than quantitative data.
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The number of questions must be limited due to time constraints: Because interviews can take a long time, it's often necessary to limit the number of questions asked.
All of the options you provided highlight a potential disadvantage of personal interviews. However, the most prominent disadvantage is typically that they are time consuming.