A Skeptical Paranormal Researcher Claims That the Proportion of Americans

A skeptical paranormal researcher claims that the proportion of Americans that have seen a UFO, p, is less than 1 in every ten thousand. Assume that a hypothesis test of the claim has been conducted and that the conclusion of the test was to reject the null hypothesis. Identify the population to which the
Results of the test apply.

A) Any sample of Americans
B) Any sample of Americans claiming to have seen a UFO
C) All Americans claiming to have seen a UFO
D) All Americans