What Is the Danger of Researchers Only Reporting on the Tests

Multiple Choice

What is the danger of researchers only reporting on the tests that came out significant (versus reporting on all the tests they conducted) ?

A) If nothing interesting is happening in the population, then 1 in 20 tests are expected to achieve statistical significance just by chance.
B) The researchers could have been 'data snooping.'
C) Results that are not statistically significant give valuable information to the public as well; not just those that are statistically significant.
D) All of the above.