Data and Information About a Published Study Are Often Shared

Data and information about a published study are often shared made available to others) in the sciences. However,

A) Investigators are often reluctant to share information
B) There are some complexities such as whether sharing data would limit plans the investigators have for further data, whether use of the data extends beyond informed consent provided by the subjects, what constitutes "the data" e.g., just what was reported or additional information that might help interpret that)
C) There may be legal obligations to share data, depending on mandates from a government funding agency
D) All of the above