In Which of the Following Situations Is Duplicate Publication of Research

Multiple Choice

In which of the following situations is duplicate publication of research findings NOT acceptable?

A) A researcher is trying to increase her reputation by having a large number of publications.
B) A researcher analyzes an old data set to test new hypotheses.
C) For efficiency, data for two separate studies are collected at the same time.
D) Results of a longitudinal study are published at several stages of the research.